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119-663: According to Ibn Khaldun , the town was founded by Banu Wargla who, accompanied by sections of the Maghrawa and Banu Ifran , left the Tlemcen region and founded Ouargla. These Berbers of Ouarghla then embraced Ibadi doctrines, which later made the town an attractive refuge for the citizens of Tahert. In the 11th century, Banu Hilal , an Arab tribe living between Nile and Red Sea , settled in Tunisia , Tripolitania (western Libya ) and Constantinois (eastern Algeria ) which

238-466: A mithqal or 2.96 grams). Ibn Khaldun's writings regarding the division of labor are often compared to Adam Smith's writings on the topic. The individual being cannot by himself obtain all the necessities of life. All human beings must co-operate to that end in their civilization. But what is obtained by the cooperation of a group of human beings satisfies the need of a number many times greater than themselves. For instance, no one by himself can obtain

357-401: A rainband ), when temperature is near freezing at the surface. The strong convection that develops has enough moisture to produce whiteout conditions at places which the line passes over as the wind causes intense blowing snow. This type of snowsquall generally lasts less than 30 minutes at any point along its path, but the motion of the line can cover large distances. Frontal squalls may form

476-607: A biography with a more detailed description on the Prolegomena . More details on and partial translations of the Prolegomena emerged over the years until the complete Arabic edition was published in 1858. Since then, the work of Ibn Khaldun has been extensively studied in the Western world with special interest. Reynold A. Nicholson praised Ibn Khaldun as a uniquely brilliant Muslim sociologist, but discounted Khaldun's influence. Spanish Philosopher José Ortega y Gasset viewed

595-433: A cirque (corrie or cwm), a typically armchair-shaped geological feature, which collects snow and where the snowpack compacts under the weight of successive layers of accumulating snow, forming névé. Further crushing of the individual snow crystals and reduction of entrapped air in the snow turns it into glacial ice. This glacial ice will fill the cirque until it overflows through a geological weakness or an escape route, such as

714-649: A crystal morphology diagram, relating crystal shapes to the temperature and moisture conditions under which they formed, which is summarized in the following table. Dendrites Hollow prisms Needles Solid plates Dendrites Solid plates Prisms Nakaya discovered that the shape is also a function of whether the prevalent moisture is above or below saturation. Forms below the saturation line tend more toward solid and compact while crystals formed in supersaturated air tend more toward lacy, delicate, and ornate. Many more complex growth patterns also form, which include side-planes, bullet-rosettes, and planar types, depending on

833-447: A droplet has frozen, it grows in the supersaturated environment—one where air is saturated with respect to ice when the temperature is below the freezing point. The droplet then grows by diffusion of water molecules in the air (vapor) onto the ice crystal surface where they are collected. Because water droplets are so much more numerous than the ice crystals, the crystals are able to grow to hundreds of micrometers or millimeters in size at

952-589: A few molecules in the droplet need to get together by chance to form an arrangement similar to that in an ice lattice. The droplet freezes around this "nucleus". In warmer clouds, an aerosol particle or "ice nucleus" must be present in (or in contact with) the droplet to act as a nucleus. Ice nuclei are very rare compared to cloud condensation nuclei on which liquid droplets form. Clays, desert dust, and biological particles can be nuclei. Artificial nuclei include particles of silver iodide and dry ice , and these are used to stimulate precipitation in cloud seeding . Once

1071-568: A hemisphere's fall , winter, and spring, the atmosphere over continents can be cold enough through the depth of the troposphere to cause snowfall. In the Northern Hemisphere, the northern side of the low-pressure area produces the most snow. For the southern mid-latitudes , the side of a cyclone that produces the most snow is the southern side. A cold front , the leading edge of a cooler mass of air, can produce frontal snowsqualls —an intense frontal convective line (similar to

1190-485: A highly porous, sintered material made up of a continuous ice structure and a continuously connected pore space, forming together the snow microstructure". Almost always near its melting temperature, a snowpack is continually transforming these properties wherein all three phases of water may coexist, including liquid water partially filling the pore space. After deposition, snow progresses on one of two paths that determine its fate, either by ablation (mostly by melting) from

1309-516: A labor theory of value or theory. Ibn Khaldun also called for the creation of a science to explain society and went on to outline these ideas in his major work, the Muqaddimah , which states that “Civilization and its well-being, as well as business prosperity, depend on productivity and people’s efforts in all directions in their own interest and profit”. Ibn Khaldun diverged from norms that Muslim historians followed and rejected their focus on

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1428-499: A meeting between Ibn Khaldun and Tamerlane. According to Ibn Arabshah, during this meeting, Ibn Khaldun and Tamerlane discussed the Maghrib in depth, as well as Tamerlane's genealogy and place in history. Ibn Khaldun began gaining more attention from 1806, when Silvestre de Sacy 's Chrestomathie Arabe included his biography together with a translation of parts of the Muqaddimah as the Prolegomena . In 1816, de Sacy again published

1547-435: A minimum extent of 2 million square kilometres (0.77 × 10 ^  sq mi) each August to a maximum extent of 45 million square kilometres (17 × 10 ^  sq mi) each January or nearly half of the land surface in that hemisphere. A study of Northern Hemisphere snow cover extent for the period 1972–2006 suggests a reduction of 0.5 million square kilometres (0.19 × 10 ^  sq mi) over

1666-530: A mountain range results in adiabatic cooling, and ultimately condensation and precipitation. Moisture is gradually removed from the air by this process, leaving drier and warmer air on the descending, or leeward , side. The resulting enhanced snowfall, along with the decrease in temperature with elevation, combine to increase snow depth and seasonal persistence of snowpack in snow-prone areas. Mountain waves have also been found to help enhance precipitation amounts downwind of mountain ranges by enhancing

1785-400: A number of people many times their own. The combined labour produces more than the needs and necessities of the workers (Ibn Khaldun 1958, vol. II 271–272) In every other art and manufacture, the effects of the division of labour are similar to what they are in this very trifling one [pin production]; though, in many of them, the labour can either be so much subdivided, nor reduced to so great

1904-570: A religious ideology. Ibn Khaldun's analysis looks at how this cohesion carries groups to power but contains within itself the seeds – psychological, sociological, economic, political – of the group's downfall, to be replaced by a new group, dynasty or empire bound by a stronger (or at least younger and more vigorous) cohesion. Some of Ibn Khaldun's views, particularly those concerning the Zanj people of sub-Saharan Africa, have been cited as racist , though they were not uncommon for their time. According to

2023-730: A remote ancestor, was born in Tunis in AD 1332 (732 AH ) into an upper-class Andalusian family of Arab descent; the family's ancestor was a Hadhrami who shared kinship with Wa'il ibn Hujr , a companion of the Islamic prophet Muhammad . His family, which held many high offices in Al-Andalus , had emigrated to Tunisia after the fall of Seville to the Reconquista in AD 1248. Although some of his family members had held political office in

2142-488: A series of snow events, punctuated by freezing and thawing, over areas that are cold enough to retain snow seasonally or perennially. Major snow-prone areas include the Arctic and Antarctic , the Northern Hemisphere, and alpine regions. The liquid equivalent of snowfall may be evaluated using a snow gauge or with a standard rain gauge , adjusted for winter by removal of a funnel and inner cylinder. Both types of gauges melt

2261-409: A short distance ahead of the surface cold front or behind the cold front where there may be a deepening low-pressure system or a series of trough lines which act similar to a traditional cold frontal passage. In situations where squalls develop post-frontally, it is not unusual to have two or three linear squall bands pass in rapid succession separated only by 25 miles (40 kilometers), with each passing

2380-441: A simplicity of operation. The division of labour, however, so far as it can be introduced, occasions, in every art, a proportionable increase of the productive powers of labour (Smith 1976a, vol. I, 13–24) Both Ibn Khaldun and Smith shared the idea that the division of labor is fundamental to economic growth, however, the motivations and context for such division differed between them. For Ibn Khaldun, asabiyyah or social solidarity

2499-419: A snow fall or seasonal snowpack, or by transitioning from firn (multi-year snow) into glacier ice . Over the course of time, a snowpack may settle under its own weight until its density is approximately 30% of water. Increases in density above this initial compression occur primarily by melting and refreezing, caused by temperatures above freezing or by direct solar radiation. In colder climates, snow lies on

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2618-608: A snowpack can create flow fingers and ponding or flow along capillary barriers, which can refreeze into horizontal and vertical solid ice formations within the snowpack. Among the measurements of the properties of snowpacks that the International Classification for Seasonal Snow on the Ground includes are: snow height, snow water equivalent, snow strength, and extent of snow cover. Each has a designation with code and detailed description. The classification extends

2737-416: A snowslide or snowslip) is a rapid flow of snow down a sloping surface. Avalanches are typically triggered in a starting zone from a mechanical failure in the snowpack (slab avalanche) when the forces on the snow exceed its strength but sometimes only with gradually widening (loose snow avalanche). After initiation, avalanches usually accelerate rapidly and grow in mass and volume as they entrain more snow. If

2856-416: A specific thing for a long period makes him forget everything and become attached to what he focused on. Only, this focus makes him see the non-sensory world very quickly and in a very imperfect way, and these are pagan religions . Ibn Khaldun agrees with Sufism and believes that if a person maintains his good faith and is stripped of the desire to create a new religion and strives to separate himself from

2975-630: A substance denser than névé , yet less dense and hard than glacial ice . Firn resembles caked sugar and is very resistant to shovelling. Its density generally ranges from 550 to 830 kilograms per cubic metre (34 to 52 lb/cu ft), and it can often be found underneath the snow that accumulates at the head of a glacier . The minimum altitude that firn accumulates on a glacier is called the firn limit , firn line or snowline . There are four main mechanisms for movement of deposited snow: drifting of unsintered snow, avalanches of accumulated snow on steep slopes, snowmelt during thaw conditions, and

3094-762: A time of Berber dynasties domination is a valid reason to believe his claim of Arab descent. His family's high rank enabled Ibn Khaldun to study with prominent teachers in Maghreb . He received a classical Islamic education , studying the Quran , which he memorized by heart , Arabic linguistics ; the basis for understanding the Qur'an, hadith , sharia (law) and fiqh (jurisprudence). He received certification ( ijazah ) for all of those subjects. The mathematician and philosopher Al-Abili of Tlemcen introduced him to mathematics , logic and philosophy , and he studied especially

3213-470: A variety of shapes, basic among these are platelets, needles, columns and rime . As snow accumulates into a snowpack , it may blow into drifts. Over time, accumulated snow metamorphoses, by sintering , sublimation and freeze-thaw . Where the climate is cold enough for year-to-year accumulation, a glacier may form. Otherwise, snow typically melts seasonally, causing runoff into streams and rivers and recharging groundwater . Major snow-prone areas include

3332-550: A very cold temperature inversion present. Snow clouds usually occur in the context of larger weather systems, the most important of which is the low-pressure area, which typically incorporate warm and cold fronts as part of their circulation. Two additional and locally productive sources of snow are lake-effect (also sea-effect) storms and elevation effects, especially in mountains. Mid-latitude cyclones are low-pressure areas which are capable of producing anything from cloudiness and mild snow storms to heavy blizzards . During

3451-575: A year, he had to resign his judgeship. Also in 1384, a ship carrying Khaldun's wife and children sank off of Alexandria . After his return from a pilgrimage to Mecca in May 1388, Ibn Khaldūn concentrated on teaching at various Cairo madrasas. At the Mamluk court he fell from favor because during revolts against Barquq, he had, apparently under duress, with other Cairo jurists, issued a fatwa against Barquq. Later relations with Barquq returned to normal, and he

3570-472: Is "the transformation that the snow undergoes in the period from deposition to either melting or passage to glacial ice". Starting as a powdery deposition, snow becomes more granular when it begins to compact under its own weight, be blown by the wind, sinter particles together and commence the cycle of melting and refreezing. Water vapor plays a role as it deposits ice crystals, known as hoar frost , during cold, still conditions. During this transition, snow "is

3689-638: Is also what inspires human beings to form into a social structure to co-operate in division of labor and organization. According to Zaid Ahmand in Epistemology and the Human Dimension in Urban Studies , the fikr faculty is the supporting pillar for all philosophical aspects of Ibn Khaldun's theory related to human beings’ spiritual, intellectual, physical, social and political tendencies. Another important concept he emphasizes in his work

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3808-429: Is not a requirement, as blowing snow can create a ground blizzard . Snowstorm intensity may be categorized by visibility and depth of accumulation. Snowfall's intensity is determined by visibility , as follows: Snowsqualls may deposit snow in bands that extend from bodies of water as lake-event weather or result from the passage of an upper-level front. The International Classification for Seasonal Snow on

3927-470: Is now a meat market, surrounded by rows of grocers' and farmers' stalls selling all sorts of fresh produce and fruits. Next to the old market are the two oldest mosques in the city, al-Masjid al-Atiq , which literally means "the old mosque," and the old Ibadi mosque, home to one of the most renowned Islamic scholars of the city, Taleb et-Tayeb. Some of Ouargla's population speak the Wargli language , part of

4046-405: Is part of. The temperature of July, which is the hottest month, is around 110 °F (43 °C). The heat becomes persistent and unpleasant in summer with temperatures sometimes exceeding 120 °F (49 °C). On average, the city of Ouargla has a temperature equal to or greater than 95 °F (35 °C) for more than 135 days and 100 °F (38 °C) for more than 83 days. The year with

4165-464: Is termed ocean-effect or bay-effect snow . The effect is enhanced when the moving air mass is uplifted by the orographic influence of higher elevations on the downwind shores. This uplifting can produce narrow but very intense bands of precipitation which may deposit at a rate of many inches of snow each hour, often resulting in a large amount of total snowfall. The areas affected by lake-effect snow are called snowbelts . These include areas east of

4284-461: Is the driest with 0.3 mm (0.012 in). Ouargla rarely sees days with a minimum temperature below 0°C. However, if one moves away from the urban area of Ouargla, frost is much more frequent in the periphery of the city. The record for the number of days below zero was in 1983 with 7 days during the month of January and 7 days during the month of December for a total of 14 days. The city sees an average of 5 days below 0°C per year. The winter with

4403-562: Is the mastery of crafts, habits and skills. This takes place after a society is established and according to Ibn Khaldun the level of achievement of a society can be determined by just analyzing these three concepts. A society in its earliest stages is nomadic and primarily concerned with survival, while a society at a later stage is sedentary, with greater achievement in crafts. A society with a sedentary culture and stable politics would be expected to have greater achievements in crafts and technology. Ibn Khaldun also emphasized in his epistemology

4522-481: Is the notion that when a society becomes a great civilization, its high point is followed by a period of decay. This means that the next cohesive group that conquers the diminished civilization is, by comparison, a group of barbarians . Once the barbarians solidify their control over the conquered society, however, they become attracted to its more refined aspects, such as literacy and arts, and either assimilate into or appropriate such cultural practices. Then, eventually,

4641-645: The Great Lakes , the west coasts of northern Japan, the Kamchatka Peninsula in Russia, and areas near the Great Salt Lake , Black Sea , Caspian Sea , Baltic Sea , and parts of the northern Atlantic Ocean. Orographic or relief snowfall is created when moist air is forced up the windward side of mountain ranges by a large-scale wind flow. The lifting of moist air up the side of

4760-595: The London School of Economics , considered Khaldun's definition of government the best in the history of political theory. More moderate views on the scope of Ibn Khaldun's contributions have also emerged. Snow Snow comprises individual ice crystals that grow while suspended in the atmosphere —usually within clouds—and then fall, accumulating on the ground where they undergo further changes. It consists of frozen crystalline water throughout its life cycle, starting when, under suitable conditions,

4879-598: The Zenati languages subgroup of the Northern Berber languages , and Wargli speakers reside in N'Goussa , as well. Ouargla has a desert climate ( Koppën Classification BWh ) typical of the Sahara Desert in which it is located. The city has very long and extremely hot summers and short and pleasant winters. The average temperatures of the city are the highest of the big cities of Algeria which Ouargla

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4998-411: The movement of glaciers after snow has persisted for multiple years and metamorphosed into glacier ice. When powdery snow drifts with the wind from the location where it originally fell, forming deposits with a depth of several meters in isolated locations. After attaching to hillsides, blown snow can evolve into a snow slab, which is an avalanche hazard on steep slopes. An avalanche (also called

5117-808: The polar regions , the northernmost half of the Northern Hemisphere and mountainous regions worldwide with sufficient moisture and cold temperatures. In the Southern Hemisphere , snow is confined primarily to mountainous areas, apart from Antarctica . Snow affects such human activities as transportation : creating the need for keeping roadways, wings, and windows clear; agriculture : providing water to crops and safeguarding livestock; sports such as skiing , snowboarding , and snowmachine travel; and warfare . Snow affects ecosystems , as well, by providing an insulating layer during winter under which plants and animals are able to survive

5236-648: The 35-year period. The following are world records regarding snowfall and snowflakes: The cities (more than 100,000 inhabitants) with the highest annual snowfall are Aomori (792 cm), Sapporo (485 cm) and Toyama (363 cm) in Japan , followed by St. John's (332 cm) and Quebec City (315 cm) in Canada , and Syracuse, NY (325 cm). According to the International Association of Cryospheric Sciences, snow metamorphism

5355-630: The Abd al-Wadid Sultan of Tlemcen, on a mission to the Dawadida Arabs tribes of Biskra. After his return to the West, Ibn Khaldūn sought refuge with one of the Berber tribes in the west of Algeria , in the town of Qalat Ibn Salama . He lived there for over three years under their protection, taking advantage of his seclusion to write the Muqaddimah "Prolegomena", the introduction to his planned history of

5474-460: The Ground defines "height of new snow" as the depth of freshly fallen snow, in centimeters as measured with a ruler, that accumulated on a snowboard during an observation period of 24 hours, or other observation interval. After the measurement, the snow is cleared from the board and the board is placed flush with the snow surface to provide an accurate measurement at the end of the next interval. Melting, compacting, blowing and drifting contribute to

5593-674: The Maghreb. At his request, Ibn Khaldūn even wrote a long report about it. As he recognized Timur's intentions, he did not hesitate, on his return to Egypt, to compose an equally-extensive report on the history of the Tatars , together with a character study of Timur, sending them to the Merinid rulers in Fez . Ibn Khaldūn spent the next five years in Cairo completing his autobiography and his history of

5712-467: The Muqaddimah, although some scholars have found his praise, and that of others, to be generally empty and lacking understanding of Ibn Khaldun's methods. Ibn Khaldun also faced primarily criticism from his contemporaries, particularly Ibn Hajar al-`Asqalani . These criticisms included accusations of inadequate historical knowledge, an inaccurate title, disorganization, and a style resembling that of

5831-663: The Sultan of Granada, the Nasrid Muhammad V , regain power from his temporary exile. In 1364, Muhammad entrusted him with a diplomatic mission to the king of Castile , Pedro the Cruel , to endorse a peace treaty. Ibn Khaldūn successfully carried out this mission and politely declined Pedro's offer to remain at his court and have his family's Spanish possessions returned to him. In Granada, Ibn Khaldūn quickly came into competition with Muhammad's vizier, Ibn al-Khatib , who viewed

5950-537: The Tunisian Hafsid dynasty , his father and grandfather later withdrew from political life and joined a mystical order . His brother, Yahya Khaldun, was also a historian who wrote a book on the Abdalwadid dynasty and was assassinated by a rival for being the official historiographer of the court. In his autobiography, Khaldun traces his descent back to the time of Muhammad through an Arab tribe from

6069-413: The accumulated snow and report the amount of water collected. At some automatic weather stations an ultrasonic snow depth sensor may be used to augment the precipitation gauge. Snow flurry , snow shower , snow storm and blizzard describe snow events of progressively greater duration and intensity. A blizzard is a weather condition involving snow and has varying definitions in different parts of

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6188-651: The achievement of a society would be the language of a society, since for him the most important element of a society would not be land, but the language spoken. He was surprised that many non-Arabs were really successful in the Arabic society, had good jobs and were well received by the community. "These people were non-Arab by descent, but they grew up among the Arabs who possessed the habit of Arabic," Ibn Khaldun once recalled, "[b]ecause of this, they were able to master Arabic so well that they cannot be surpassed." He believed that

6307-458: The avalanche moves fast enough some of the snow may mix with the air forming a powder snow avalanche, which is a type of gravity current . They occur in three major mechanisms: Many rivers originating in mountainous or high-latitude regions receive a significant portion of their flow from snowmelt. This often makes the river's flow highly seasonal resulting in periodic flooding during the spring months and at least in dry mountainous regions like

6426-412: The beginning, people will look for different ways of increasing productivity of basic needs and expansion will occur. Later the society starts becoming more sedentary and focuses more on crafting, arts and the more refined characteristics. By the end of a society, it will weaken, allowing another small group of individuals to come into control. The conquering group is described as an unsatisfied group within

6545-488: The city of Ouargla is limited to only 55 mm (2.2 in) per year in average. The most rainy year lived in Ouargla was that of 1903 with 135 mm (5.3 in). The most arid year was that of 1929 with 0 mm. The year of 1903, which was the rainiest in Ouargla, still had nine constant months with a rainfall of 0 mm, from February to October. January is the rainiest month with 12.4 mm (0.49 in). August

6664-606: The close relationship between Muhammad and Ibn Khaldūn with increasing mistrust. Ibn Khaldūn tried to shape the young Muhammad into his ideal of a wise ruler, an enterprise that Ibn al-Khatib thought foolish and a danger to peace in the country. As a result of al-Khatib's influence, Ibn Khaldūn was eventually sent back to North Africa. Al-Khatib himself was later accused by Muhammad of having unorthodox philosophical views and murdered despite an attempt by Ibn Khaldūn to intercede on behalf of his old rival. In his autobiography, Ibn Khaldūn tells little about his conflict with Ibn al-Khatib and

6783-462: The cold. Snow develops in clouds that themselves are part of a larger weather system. The physics of snow crystal development in clouds results from a complex set of variables that include moisture content and temperatures. The resulting shapes of the falling and fallen crystals can be classified into a number of basic shapes and combinations thereof. Occasionally, some plate-like, dendritic and stellar-shaped snowflakes can form under clear sky with

6902-448: The conditions and ice nuclei. If a crystal has started forming in a column growth regime at around −5 °C (23 °F) and then falls into the warmer plate-like regime, plate or dendritic crystals sprout at the end of the column, producing so called "capped columns". Magono and Lee devised a classification of freshly formed snow crystals that includes 80 distinct shapes. They documented each with micrographs. Snow accumulates from

7021-404: The conflicts of North Africa as a problem that stemmed from a lack of African thought, and praised Ibn Khaldun for making sense of the conflict by simplifying it to the relationship between the nomadic and sedentary modes of life. British historian Arnold J. Toynbee has called Ibn Khaldun's Muqaddimah "the greatest work of its kind." Ernest Gellner , once a professor of philosophy and logic at

7140-544: The contribution of snowmelt to river hydraulics and ground hydrology . In doing so, they employ a variety of instruments to observe and measure the phenomena studied. Their findings contribute to knowledge applied by engineers , who adapt vehicles and structures to snow, by agronomists , who address the availability of snowmelt to agriculture , and those, who design equipment for sporting activities on snow. Scientists develop and others employ snow classification systems that describe its physical properties at scales ranging from

7259-446: The credibility of the transmitter and focused instead on the validity of the stories and encouraged critical thinking. Ibn Khaldun also outlines early theories of division of labor, taxes, scarcity, and economic growth. He argued that poverty was a result of the destruction of morality and human values. He also looked at what factors contribute to wealth, such as consumption, government, and investment. Khaldun also argued that poverty

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7378-450: The crystal facets and hollows/imperfections mean that the crystals often appear white in color due to diffuse reflection of the whole spectrum of light by the small ice particles. Micrography of thousands of snowflakes from 1885 onward, starting with Wilson Alwyn Bentley , revealed the wide diversity of snowflakes within a classifiable set of patterns. Closely matching snow crystals have been observed. Ukichiro Nakaya developed

7497-407: The currency of an Islamic monetary system should have intrinsic value and therefore be made of gold and silver (such as the dirham ). He emphasized that the weight and purity of these coins should be strictly followed: the weight of one dinar should be one mithqal (the weight of 72 grains of barley , roughly 4.25 grams) and the weight of 7 dinar should be equal to weight of 10 dirhams (7/10 of

7616-424: The death of Abū Inan in 1358, Vizier al-Hasān ibn-Umar granted him freedom and reinstated him to his rank and offices. Ibn Khaldūn then schemed against Abū Inan's successor, Abū Salem Ibrahim III, with Abū Salem's exiled uncle, Abū Salem. When Abū Salem came to power, he gave Ibn Khaldūn a ministerial position, the first position to correspond with Ibn Khaldūn's ambitions. The treatment that Ibn Khaldun received after

7735-446: The decline of a society, since it would constrain the development of more specialized labor (increase in scholars and development of different services). He believed that bureaucrats cannot understand the world of commerce and do not possess the same motivation as a businessman. In his work the Muqaddimah, Ibn Khaldun emphasizes human beings' faculty to think ( fikr ) as what determines human behavior and ubiquitous patterns. This faculty

7854-536: The dichotomy of sedentary life versus nomadic life as well as the inevitable loss of power that occurs when warriors conquer a city. According to the Arab scholar Sati' al-Husri , the Muqaddimah may be read as a sociological work. The work is based around Ibn Khaldun's central concept of 'aṣabiyyah , translated as " group cohesiveness " or "solidarity". This social cohesion arises spontaneously in tribes and other small kinship groups; it can be intensified and enlarged by

7973-446: The difficulty of measuring snowfall. Glaciers with their permanent snowpacks cover about 10% of the earth's surface, while seasonal snow covers about nine percent, mostly in the Northern Hemisphere, where seasonal snow covers about 40 million square kilometres (15 × 10 ^  sq mi), according to a 1987 estimate. A 2007 estimate of snow cover over the Northern Hemisphere suggested that, on average, snow cover ranges from

8092-779: The economists David Ricardo and Adam Smith , suggesting that their ideas found precedent (although not direct influence) in his. He has also been influential on certain modern Islamic thinkers (e.g. those of the traditionalist school ). Ibn Khaldun's life is relatively well-documented, as he wrote an autobiography ( التعريف بابن خلدون ورحلته غربا وشرقا , at-Taʻrīf bi-ibn Khaldūn wa-Riḥlatih Gharban wa-Sharqan ; Presenting Ibn Khaldun and his Journey West and East ) in which numerous documents regarding his life are quoted word-for-word. Abū Zayd 'Abdu r-Rahman bin Muhammad bin Khaldūn Al-Hadrami, generally known as "Ibn Khaldūn" after

8211-483: The expense of the water droplets by the Wegener–Bergeron–Findeisen process . These large crystals are an efficient source of precipitation, since they fall through the atmosphere due to their mass, and may collide and stick together in clusters, or aggregates. These aggregates are snowflakes , and are usually the type of ice particle that falls to the ground. Although the ice is clear, scattering of light by

8330-524: The fall of Abū Salem through Ibn-Amar ʻAbdullah, a friend of Ibn Khaldūn's, was not to his liking, as he received no significant official position. At the same time, Amar successfully prevented Ibn Khaldūn, whose political skills he knew well, from allying with the Abd al-Wadids in Tlemcen. Ibn Khaldūn, therefore, decided to move to Granada . He could be sure of a positive welcome there since at Fez, he had helped

8449-577: The first and fourth books of the Kitab al-‘Ibar, in developing a work of mirrors for princes. Ibn Khaldun's work found some recognition with Ottoman intellectuals in the 17th century. The first references to Ibn Khaldun in Ottoman writings appeared in the middle of the 17th century, with historians such as Kâtip Çelebi naming him as a great influence, while another Turkish Ottoman historian, Mustafa Naima , attempted to use Ibn Khaldun's cyclical theory of

8568-428: The former barbarians will be conquered by a new set of barbarians, who will repeat the process. Georgetown University Professor Ibrahim Oweiss , an economist and historian, argues that Ibn Khaldun was a major forerunner of modern economists and, in particular, originated the labor theory of value long before better known proponents such as Adam Smith and David Ricardo , although Khaldun did not refer to it as either

8687-403: The future with different societies. He tried to adapt to all possible societies’ cultural behavior and influence in education, economics and politics. Nonetheless, he didn't think that laws were chosen by just one leader or a small group of individual but mostly by the majority of the individuals of a society. To Ibn Khaldun, the state was a necessity of human society to restrain injustice within

8806-442: The gap between two mountains. When the mass of snow and ice is sufficiently thick, it begins to move due to a combination of surface slope, gravity and pressure. On steeper slopes, this can occur with as little as 15 m (49 ft) of snow-ice. Scientists study snow at a wide variety of scales that include the physics of chemical bonds and clouds ; the distribution, accumulation, metamorphosis, and ablation of snowpacks; and

8925-453: The ground all winter. By late spring, snow densities typically reach a maximum of 50% of water. Snow that persists into summer evolves into névé , granular snow, which has been partially melted, refrozen and compacted. Névé has a minimum density of 500 kilograms per cubic metre (31 lb/cu ft), which is roughly half of the density of liquid water. Firn is snow that has persisted for multiple years and has been recrystallized into

9044-568: The growth and decline of the Ottoman Empire . Ibn Khaldun interacted with Tamerlane , the founder of the Timurid Empire . He has been called one of the most prominent Muslim and Arab scholars and historians. Recently, Ibn Khaldun's works have been compared with those of influential European philosophers such as Niccolò Machiavelli , Giambattista Vico , David Hume , G. W. F. Hegel , Karl Marx , and Auguste Comte as well as

9163-448: The ice crystals form in the atmosphere, increase to millimeter size, precipitate and accumulate on surfaces, then metamorphose in place, and ultimately melt, slide or sublimate away. Snowstorms organize and develop by feeding on sources of atmospheric moisture and cold air. Snowflakes nucleate around particles in the atmosphere by attracting supercooled water droplets, which freeze in hexagonal-shaped crystals. Snowflakes take on

9282-406: The important aspect that educational tradition plays to ensure the new generations of a civilization continuously improve in the sciences and develop culture. Ibn Khaldun argued that without the strong establishment of an educational tradition, it would be very difficult for the new generations to maintain the achievements of the earlier generations, let alone improve them. Another way to distinguish

9401-445: The individual crystal to the aggregated snowpack. A sub-specialty is avalanches , which are of concern to engineers and outdoors sports people, alike. Snow science addresses how snow forms, its distribution, and processes affecting how snowpacks change over time. Scientists improve storm forecasting, study global snow cover and its effect on climate, glaciers, and water supplies around the world. The study includes physical properties of

9520-615: The lift needed for condensation and precipitation. A snowflake consists of roughly 10 water molecules which are added to its core at different rates and in different patterns depending on the changing temperature and humidity within the atmosphere that the snowflake falls through on its way to the ground. As a result, snowflakes differ from each other though they follow similar patterns. Snow crystals form when tiny supercooled cloud droplets (about 10  μm in diameter) freeze . These droplets are able to remain liquid at temperatures lower than −18 °C (0 °F), because to freeze,

9639-461: The local Berber tribes. After the death of Abū ʻAbdallāh in 1366, Ibn Khaldūn changed sides once again and allied himself with the Sultan of Tlemcen , Abū l-Abbas. A few years later, he was taken prisoner by Abu Faris Abdul Aziz , who had defeated the sultan of Tlemcen and seized the throne. He then entered a monastic establishment and occupied himself with scholastic duties until 1370. In that year, he

9758-563: The material as it changes, bulk properties of in-place snow packs, and the aggregate properties of regions with snow cover. In doing so, they employ on-the-ground physical measurement techniques to establish ground truth and remote sensing techniques to develop understanding of snow-related processes over large areas. In the field snow scientists often excavate a snow pit within which to make basic measurements and observations. Observations can describe features caused by wind, water percolation, or snow unloading from trees. Water percolation into

9877-460: The most days with a temperature equal to or greater than 100 °F was in 2014 with 99 days, while the lowest total was 39 days in 1981. By comparison, the city of Carpentras in France had a total of 16 days since 1963 when the temperature was equivalent or above 100 °F. The highest minimum temperature recorded at Ouargla was 36.6 °C (97.9 °F) on July 31, 2005. The highest temperature

9996-701: The most frost in Ouargla was from 1999 to 2000 with a total of 55 days. Snow is very rare in Ouargla, and only occurs in exceptional cases and in a small quantity. The lowest temperature recorded at Ouargla is −3.7 °C (25.3 °F) on January 16, 2001, while the lowest maximum temperature is 8 °C (46 °F) on January 27, 2005. The commune comprises 15 localities: Ibn Khaldun Ibn Khaldun ( / ˈ ɪ b ən h æ l ˈ d uː n / IH -bun hal- DOON ; Arabic : أبو زيد عبد الرحمن بن محمد بن خلدون الحضرمي , Abū Zayd ‘Abd ar-Raḥmān ibn Muḥammad ibn Khaldūn al-Ḥaḍramī , Arabic: [ibn xalduːn] ; 27 May 1332 – 17 March 1406, 732–808 AH )

10115-451: The mountain West of the US or most of Iran and Afghanistan , very low flow for the rest of the year. In contrast, if much of the melt is from glaciated or nearly glaciated areas, the melt continues through the warm season, with peak flows occurring in mid to late summer. Glaciers form where the accumulation of snow and ice exceeds ablation. The area in which an alpine glacier forms is called

10234-840: The power of Islam." While other Islamic regions had to cope with border wars and inner strife, Mamluk Egypt enjoyed prosperity and high culture. In 1384, the Egyptian Sultan, al-Malik udh-Dhahir Barquq , made Khaldun professor of the Qamhiyyah Madrasah and appointed him as the Grand qadi of the Maliki school of fiqh (one of four schools, the Maliki school was widespread primarily in Western Africa ). His efforts at reform encountered resistance, however, and within

10353-483: The prolific Arab literature writer, Al-Jahiz . Al-Asqalani also noted that Ibn Khaldun was not well-liked in Egypt because he opposed many respected traditions, including the traditional judicial dress, and suggested that this may have contributed to the reception of Ibn Khaldun's historical works. The notable exception to this consensus was Ibn al-Azraq , a jurist who lived shortly after Ibn Khaldun and quoted heavily from

10472-562: The quality of knowledge. For him the highest level of literary productions would be the manifestation of prose, poems and the artistic enrichment of a society. Ibn Khaldun believes that communication between the tangible and intangible world is the basis of every religion , and the credit for its occurrence is the human spirit, as it is the mediator between God and humans. It is immortal by nature and does not perish, and has characteristics that enable it to communicate with God. However, most souls have lost their hidden ability and are connected to

10591-517: The reason why non-Arabs were accepted as part of Arab society was due to their mastery of the Arabic language. Advancements in literary works such as poems and prose were another way to distinguish the achievement of a civilization, but Ibn Khaldun believed that whenever the literary facet of a society reaches its highest levels it ceases to indicate societal achievements anymore, but is an embellishment of life. For logical sciences he established knowledge at its highest level as an increase of scholars and

10710-568: The reasons for his departure. Orientalist Muhsin Mahdi interprets that as showing that Ibn Khaldūn later realised that he had completely misjudged Muhammad V. Back in Ifriqiya , the Hafsid sultan of Béjaïa , Abū ʻAbdallāh, who had been his companion in prison, received him with great enthusiasm and made Ibn Khaldūn his prime minister. Ibn Khaldūn carried out a daring mission to collect taxes among

10829-804: The rise and fall of empires to describe the Ottoman Empire. Increasing perceptions of the decline of the Ottoman Empire also caused similar ideas to appear independently of Ibn Khaldun in the 16th century, and may explain some of the influence of his works. In Europe, Ibn Khaldun was first brought to the attention of the Western world in 1697, when a biography of him appeared in Barthélemy d'Herbelot de Molainville 's Bibliothèque Orientale . However, some scholars believe that Ibn Khaldun's work may have first been introduced to Europe via Ibn Arabshah's biography of Tamerlane, translated to Latin, which covers

10948-741: The rise of a new society which would then follow the same trends in a continuous cycle. Also, he recommended the best political approaches to develop a society according to his knowledge of history. He heavily emphasized that a good society would be one in which a tradition of education is deeply rooted in its culture. Ibn Khaldun (1987) introduced the word asabiya (solidarity, group feeling, or group consciousness), to explain tribalism. The concept of asabiya has been translated as "social cohesion," "group solidarity," or "tribalism." This social cohesion arises spontaneously in tribes and other small kinship groups (Rashed,2017). Ibn Khaldun believed that too much bureaucracy, such as taxes and legislations, would lead to

11067-401: The same point roughly 30 minutes apart. In cases where there is a large amount of vertical growth and mixing, the squall may develop embedded cumulonimbus clouds resulting in lightning and thunder which is dubbed thundersnow . A warm front can produce snow for a period as warm, moist air overrides below-freezing air and creates precipitation at the boundary. Often, snow transitions to rain in

11186-433: The scholar Abdelmajid Hannoum, Ibn Khaldun's description of the distinctions between Berbers and Arabs were misinterpreted by the translator William McGuckin de Slane , who wrongly inserted a "racial ideology that sets Arabs and Berbers apart and in opposition" into his translation of part of `Ibar translated under the title Histoire des Berbères. Perhaps the most frequently cited observation drawn from Ibn Khaldūn's work

11305-528: The sensory world only. A small number of them still maintain their full ability to communicate with God. These are the ones God chose and they became prophets , so their souls leave the sensory world to receive from God. Their souls abandon the sensory world in order to receive from God what they should convey to humans. Religions arise only from this connection. He believes that religions that rely on institutions of prediction and reconnaissance are false, but they partly contain some truth. A person’s concentration on

11424-438: The sensory world, he will be able to approach the divine essence and the ideas of scholars will appear to him clearly. But if he strives in this detachment and mysticism out of a desire to excel over others, he will not communicate with God, but with demons . Also, the human spirit is able to see some things of the future through vision, but on the condition that this spirit be completely upright and very pious and pure, otherwise

11543-442: The share of the wheat he needs for food. But when six or ten persons, including a smith and a carpenter to make the tools, and others who are in charge of the oxen, the ploughing of, the harvesting of the ripe grain, and all other agricultural activities, undertake to obtain their food and work toward that purpose either separately or collectively and thus obtain through their labour a certain amount of food, that amount will be food for

11662-524: The short-lived regimes of the time. Ibn Khaldūn's autobiography is the story of an adventure, in which he spends time in prison, reaches the highest offices and falls again into exile. At the age of 20, he began his political career in the chancellery of the Tunisian ruler Ibn Tafrakin with the position of Kātib al-'Alāmah (seal-bearer), which consisted of writing in fine calligraphy the typical introductory notes of official documents. In 1352, Abū Ziad,

11781-427: The society itself or a group of desert bandits that constantly attack other weaker or weakened societies. In the Muqaddimah, his most important work, he discusses an introduction of philosophy to history in a general manner, based on observable patterns within a theoretical framework of known historical events of his time. He described the beginnings, development, cultural trends and the fall of all societies, leading to

11900-432: The society, but the state means is force, thus itself an injustice. All societies must have a state governing them in order to establish a society. He attempted to standardize the history of societies by identifying ubiquitous phenomena present in all societies. To him, civilization was a phenomenon that will be present as long as humans exist. He characterized the fulfillment of basic needs as the beginning of civilization. At

12019-706: The south of the Arabian Peninsula , specifically the Hadhramaut , which came to the Iberian Peninsula in the 8th century, at the beginning of the Islamic conquest: "And our ancestry is from Hadhramaut, from the Arabs of Arabian Peninsula, via Wa'il ibn Hujr also known as Hujr ibn 'Adi , from the best of the Arabs, well-known and respected." (p. 2429, Al-Waraq's edition). Ibn Khaldun's insistence and attachment to his claim of Arab ancestry at

12138-461: The sultan of Constantine , marched on Tunis and defeated it. Ibn Khaldūn, in any case unhappy with his respected but politically meaningless position, followed his teacher Abili to Fez . There, the Marinid sultan, Abū Inan Fares I, appointed him as a writer of royal proclamations, but Ibn Khaldūn still schemed against his employer, which, in 1357, got the 25-year-old a 22-month prison sentence. Upon

12257-513: The vision will come from the devils. From other sources we know of several other works, primarily composed during the time he spent in North Africa and Al-Andalus . His first book, Lubābu l-Muhassal , a commentary on the Islamic theology of Fakhr al-Din al-Razi , was written at the age of 19 under the supervision of his teacher Al-Abili in Tunis. A work on Sufism , Shifā'u l-Sā'il ,

12376-406: The warm sector behind the front. Lake-effect snow is produced during cooler atmospheric conditions when a cold air mass moves across long expanses of warmer lake water, warming the lower layer of air which picks up water vapor from the lake, rises up through the colder air above, freezes, and is deposited on the leeward (downwind) shores. The same effect occurring over bodies of salt water

12495-500: The works of Averroes , Avicenna , Razi and Tusi . At the age of 17, Ibn Khaldūn lost both his parents to the Black Death , an intercontinental epidemic of the plague that hit Tunis in 1348–1349. Following family tradition, he strove for a political career. In the face of a tumultuous political situation in North Africa, that required a high degree of skill in developing and dropping alliances prudently to avoid falling with

12614-425: The world and acting as teacher and judge. Meanwhile, he was alleged to have joined an underground party, Rijal Hawa Rijal , whose reform -oriented ideals attracted the attention of local political authorities. The elderly Ibn Khaldun was placed under arrest. He died on 17 March 1406, one month after his sixth selection for the office of the Maliki qadi (Judge). Concerning the discipline of sociology , he described

12733-431: The world. In Ibn Salama, however, he lacked the necessary texts to complete the work. Therefore, in 1378, he returned to his native Tunis, which had meanwhile been conquered by Abū l-Abbas, who took Ibn Khaldūn back into his service. There, he devoted himself almost exclusively to his studies and completed his history of the world. His relationship with Abū l-Abbas remained strained, as the latter questioned his loyalty. That

12852-551: The world. In the United States , a blizzard occurs when two conditions are met for a period of three hours or more: a sustained wind or frequent gusts to 35 miles per hour (16 m/s), and sufficient snow in the air to reduce visibility to less than 0.4 kilometers (0.25 mi). In Canada and the United Kingdom , the criteria are similar. While heavy snowfall often occurs during blizzard conditions, falling snow

12971-457: The young and inexperienced Faraj, concerned about a revolt in Egypt, left his army to its own devices in Syria and hurried home. Ibn Khaldūn remained at the besieged city for seven weeks, being lowered over the city wall by ropes to negotiate with Timur, in a historic series of meetings that he reported extensively in his autobiography. Timur questioned him in detail about conditions in the lands of

13090-524: Was Ouargla party. In the 19th century, the town was known for being on a caravan route to the south, and a starting point for exploring the southern Sahara . The city was a significant tourist attraction until the civil unrest of the 1990s. Many tourists shopped for sand roses at the souk l'ehjar , the old rock market. The souq , or market, had many traditional shops filled with antiques, traditional crafts, and various local items ranging from dresses to stuffed reptiles. The area across from these shops

13209-685: Was an Arab sociologist , philosopher , and historian widely acknowledged to be one of the greatest social scientists of the Middle Ages , and considered by many to be the father of historiography , sociology , economics , and demography studies. His best-known book, the Muqaddimah or Prolegomena ("Introduction"), which he wrote in six months as he states in his autobiography, influenced 17th-century and 19th-century Ottoman historians such as Kâtip Çelebi , Mustafa Naima and Ahmed Cevdet Pasha , who used its theories to analyze

13328-454: Was brought into sharp contrast after Ibn Khaldūn presented him with a copy of the completed history that omitted the usual panegyric to the ruler. Under pretence of going on the Hajj to Mecca , something for which a Muslim ruler could not simply refuse permission, Ibn Khaldūn was able to leave Tunis and to sail to Alexandria . Ibn Khaldun said of Egypt , "He who has not seen it does not know

13447-521: Was composed around 1373 in Fes, Morocco . Whilst at the court of Muhammed V, Sultan of Granada , Ibn Khaldūn composed a work on logic , ʻallaqa li-s-Sulṭān . Ibn Khaldun's historical method had very few precedents or followers in his time. While Ibn Khaldun is known to have been a successful lecturer on jurisprudence within religious sciences, only very few of his students were aware of, and influenced by, his Muqaddimah. One such student, Al-Maqrizi , praised

13566-505: Was not necessarily a result of poor financial decision-making but of external consequences and therefore the government should be involved in alleviating poverty. Researchers from Malaysia's Insaniah University College and Indonesia's Tazkia University College of Islamic Economics created a dynamics model based upon Ibn Khaldun's writings to measure poverty in the Muslim nations of South Asia and Southeast Asia. Ibn Khaldun also believed that

13685-493: Was once again named the Maliki qadi . Altogether, he was called six times to that high office, which, for various reasons, he never held long. In 1401, under Barquq's successor, his son Faraj , Ibn Khaldūn took part in a military campaign against the Mongol conqueror, Timur , who besieged Damascus in 1400. Ibn Khaldūn cast doubt upon the viability of the venture and really wanted to stay in Egypt. His doubts were vindicated, as

13804-402: Was recorded on August 13, 1984, at 53.5 °C (128.3 °F), although that reading is disputed by some meteorologists thus leaving reading 51.3 °C (124.3 °F) recorded on 5 July 2018 as the highest reliable reading for Ouargla, for Algeria and for whole continent of Africa. The climate is particularly arid and not very rainy with clear skies most of the time. The rainfall recorded in

13923-473: Was sent for to Tlemcen by the new sultan. After the death of ʻAbdu l-Azīz, he resided at Fez, enjoying the patronage and confidence of the regent. Ibn Khaldūn's political skills and, above all, his good relationship with the wild Berber tribes were in high demand among the North African rulers, but he had begun to tire of politics and constantly switching allegiances. In 1375, he was sent by Abū Hammu ,

14042-600: Was the underlying motive and context behind the division of labor; for Smith it was self-interest and the market economy. Ibn Khaldun's epistemology attempted to reconcile mysticism with theology by dividing science into two different categories, the religious science that regards the sciences of the Qur'an and the non-religious science. He further classified the non-religious sciences into intellectual sciences such as logic, arithmetic, geometry, astronomy, etc. and auxiliary sciences such as language, literature, poetry, etc. He also suggested that possibly more divisions will appear in

14161-429: Was used to display sand roses and mineral specimens of all sizes and shapes. The market has since gone through a renovation process. Not far from the souk l'ehjar is the old farmers’ market, or the "Sunday market", as it is called by the locals. It, too, is located in the centre of the old city, La Kasbah. At its centre, the original old market is shaped as a circle and split into small arcs. The centre circular structure

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