Sibt al-Maridini, full name Muḥammad ibn Muḥammad ibn Aḥmad Abū ʿAbd Allāh Badr

hams Ham is pork from a leg cut that has been preserved by wet or dry curing, with or without smoking."Bacon: Bacon and Ham Curing" in '' Chambers's Encyclopædia''. London: George Newnes, 1961, Vol. 2, p. 39. As a processed meat, the term " ...

al‐Dīnal‐Miṣrī al‐Dimashqī (1423 – 1506 AD), was an

astronomer An astronomer is a scientist in the field of astronomy who focuses their studies on a specific question or field outside the scope of Earth. They observe astronomical objects such as stars, planets, moons, comets and galaxies – in either o ...

and

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, mathematical structure, structure, space, Mathematica ...

. () His father came from Damascus. The word "Sibt al-Maridini" means "the son of Al-Mardini's daughter". His maternal grandfather,

Abdullah al-Maridini Abdullah may refer to: * Abdullah (name), a list of people with the given name or surname * Abdullah, Kargı, Turkey, a village * ''Abdullah'' (film), a 1980 Bollywood film directed by Sanjay Khan * '' Abdullah: The Final Witness'', a 2015 Paki ...

, was a reputed astronomer of the eighth century AH. He was a disciple of the astronomer

Ibn al-Majdi Shihāb al‐Dīn ibn al‐Majdī ( ar, شهاب الدين بن المجدي; 1359–1447 CE) was an Egyptian mathematician and astronomer. His most important mathematical work was "''Book of Substance''", a voluminous commentary on the ''Summar ...

(d. 850/1506), according to tradition. () Sibt al-Maridini taught mathematics and

astronomy Astronomy () is a natural science that studies astronomical object, celestial objects and phenomena. It uses mathematics, physics, and chemistry in order to explain their origin and chronology of the Universe, evolution. Objects of interest ...

in the Great Mosque of

al-Azhar Al-Azhar Mosque ( ar, الجامع الأزهر, al-Jāmiʿ al-ʾAzhar, lit=The Resplendent Congregational Mosque, arz, جامع الأزهر, Gāmiʿ el-ʾazhar), known in Egypt simply as al-Azhar, is a mosque in Cairo, Egypt in the historic ...

, Cairo. He was also a timekeeper (

muwaqqit In the history of Islam, a ''muwaqqit'' ( ar, مُوَقَّت, more rarely ''mīqātī'') was an astronomer tasked with the timekeeping and the regulation of prayer times in an Islamic institution like a mosque or a madrasa. Unlike the muez ...

) of the mosque. He wrote treatises in astronomy ( sine quadrants,

sundials A sundial is a horological device that tells the time of day (referred to as civil time in modern usage) when direct sunlight shines by the apparent position of the Sun in the sky. In the narrowest sense of the word, it consists of a fl ...

, ) () and wrote at least twenty-three mathematics textbooks. Al-Sakhawy counted two hundred books that were written by Sibt al-Maridini, on Islamic law, astronomy, and mathematics. Libraries that specialize in ancient manuscripts, all over the world, have transcripts of his works. Sibt al-Mardini’s declared that “the opinion of the muezzins (those who call people to prayer) is less correct than that of the legal scholars and it is the latter that should be used as the basis for the determination of prayer time”.

Works

:* ''Sharh al-Rahbiyah'' a commentary on the work of al-Rahbi (d. 579 AH/1183 AD) on Fara'id (shares of inheritance) :* ''Sharh al-Muqni' fi 'ilm al-Jabr wa al-Muqabalah'' (commentary on ''al-Muqni' ''about the science of calculation by completion and balancing. ''al-Muqni' ''is a work of Shihabuddin ibn Ahmad ibn al-Hayim.) :* ''Daqa'iq al-Haqa'iq'' :* ''Risāla fī al‐ʿAmal bi‐ʾl‐rubʿ al‐mujayyab'' (on using the sine quadrant) () :* ''Raqāʾiq al‐ḥaqāʾiq'' (on calculating with degrees and minutes) () :* ''Zubd al‐raqāʾiq'' (this may be an extract from the previous treatise) () :* ''Muqaddima'' (introduction) to sine problems and spherical relations () :* ''al‐Ṭuruq al‐saniyya ''(on sexagesimal calculations) () :* ''al‐Nujūm al‐ẓāhirāt'' (on the muqanṭarāt quadrant) () :* ''Qaṭf al‐ẓāhirāt'' (apparently an extract from the previous treatise) () :* ''Hāwī al‐mukhtaṣarāt'' (another discussion of the muqanṭarāt quadrant) () :* ''Iẓḥār al‐sirr al‐mawḍūʿ'' (use of a specialized quadrant) () :* ''Hidāyat al‐ʿāmil'' (on another kind of specialized quadrant) () :* ''Hidāyat al‐sāʾil'' (on the quadrant mentioned in the previous entry) () :* ''al‐Maṭlab'' (on the sine quadrant) () :* '' al‐Tuḥfa al‐manṣūriyya'' (on quadrants) () :* ''Muqaddima'' (introduction to construction of sundials) () :* a treatise on the equatorial circle () :* a treatise on the quadrant, astrolabe, and calendar ()

References

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{{DEFAULTSORT:Sibt Al-Mardini 1423 births 1506 deaths Medieval Egyptian astronomers Medieval Syrian astronomers Medieval Egyptian mathematicians Medieval Syrian mathematicians 15th-century astronomers 15th-century astrologers 15th-century Syrian people