Abu Jafar Ahmad ibn Yusuf ibn al‐Kammad (Arabic: أحمد بن يوسف ابن الكماد) (died 1195) was a Muslim Arab astronomer born in Seville, Al-Andalus. He is known to have been educated in Cordoba by the students of Al-Zarqali. His works such as al Kawr ala al dawr, al Amad ala al abad, and al Muqtabas, which is a compilation of the two previous Zij, made him famous not only on the Iberian peninsula but across North Africa, and specifically Tunisia, where the astronomer Ibn Ishaq al-Tunisi wrote commentaries on his works.
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| - ابن الحماد (ar)
- Ibn al-Kammad (en)
- Ibn al-Kammad (pt)
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| - أبو جعفر أحمد بن يوسف ابن الحماد (توفي عام 1195) فلكي مسلم ولد في إشبيلية في الأندلس. أكمل تعليمه في قرطبة من قبل طلاب الزرقالي. من أعماله: زيج (الكور على الدور) وزيج (الأمد على الأبد) وجمعت في (المقتبس)، وقد جعلت شهرته في أنحاء ليس فقط في شبه الجزيرة الايبيرية بل في جميع أنحاء شمال أفريقيا، وخاصة تونس، حيث أن الفلكي ابن إسحاق التونسي كتب بعض الملاحظات على أعماله. (ar)
- Abu Jafar Ahmad ibn Yusuf ibn al‐Kammad (Arabic: أحمد بن يوسف ابن الكماد) (died 1195) was a Muslim Arab astronomer born in Seville, Al-Andalus. He is known to have been educated in Cordoba by the students of Al-Zarqali. His works such as al Kawr ala al dawr, al Amad ala al abad, and al Muqtabas, which is a compilation of the two previous Zij, made him famous not only on the Iberian peninsula but across North Africa, and specifically Tunisia, where the astronomer Ibn Ishaq al-Tunisi wrote commentaries on his works. (en)
- Abu Jafar Ahmad ibn Yusuf ibn al‐Kammad (d.1195) foi um astrônomo muçulmano nascido em Sevilha, Al-Andalus. É conhecido por ter sido educado em Córdova (Espanha) pelos estudantes de Al-Zarqali. Seus trabalhos, tais como al Kawr ala al dawr, al Amad ala al abad e al Muqtabas, que é uma compilação de dois anteriores, o fez famoso não apenas na Península Ibérica mas através da África do Norte, e especificamente na Tunísia, onde o astrônomo escreveu comentários sobre seus trabalhos. (pt)
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| - أبو جعفر أحمد بن يوسف ابن الحماد (توفي عام 1195) فلكي مسلم ولد في إشبيلية في الأندلس. أكمل تعليمه في قرطبة من قبل طلاب الزرقالي. من أعماله: زيج (الكور على الدور) وزيج (الأمد على الأبد) وجمعت في (المقتبس)، وقد جعلت شهرته في أنحاء ليس فقط في شبه الجزيرة الايبيرية بل في جميع أنحاء شمال أفريقيا، وخاصة تونس، حيث أن الفلكي ابن إسحاق التونسي كتب بعض الملاحظات على أعماله. (ar)
- Abu Jafar Ahmad ibn Yusuf ibn al‐Kammad (Arabic: أحمد بن يوسف ابن الكماد) (died 1195) was a Muslim Arab astronomer born in Seville, Al-Andalus. He is known to have been educated in Cordoba by the students of Al-Zarqali. His works such as al Kawr ala al dawr, al Amad ala al abad, and al Muqtabas, which is a compilation of the two previous Zij, made him famous not only on the Iberian peninsula but across North Africa, and specifically Tunisia, where the astronomer Ibn Ishaq al-Tunisi wrote commentaries on his works. An astrological work, Kitāb Mafātīḥ alasrār, (in which he states the duration of pregnancy depended on the horoscope) is also attributed to him and was strongly criticized by Ibn al‐Haim al‐Ishbili in the latter's al Zīj al kāmil (c.1205). (en)
- Abu Jafar Ahmad ibn Yusuf ibn al‐Kammad (d.1195) foi um astrônomo muçulmano nascido em Sevilha, Al-Andalus. É conhecido por ter sido educado em Córdova (Espanha) pelos estudantes de Al-Zarqali. Seus trabalhos, tais como al Kawr ala al dawr, al Amad ala al abad e al Muqtabas, que é uma compilação de dois anteriores, o fez famoso não apenas na Península Ibérica mas através da África do Norte, e especificamente na Tunísia, onde o astrônomo escreveu comentários sobre seus trabalhos. Um trabalho astrológico, Kitāb Mafātīḥ alasrār, (no qual estabelece que a duração da gravidez dependia do horóscopo) é também atribuído a ele e foi fortemente criticado por no último al Zīj al kāmil (c.1205). (pt)
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