Block design

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Name: Jodi Junker
My age: 32
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Abū al-Wafāʾ, Muḥammad ibn Muḥammad ibn Yaḥyā ibn Ismāʿīl ibn al-ʿAbbās al-Būzjānī (Template:Lang-fa) [1] (10 June 940 – 15 July 998) was a Persian[2] mathematician and astronomer who worked in Baghdad. He made important innovations in spherical trigonometry, and his work on arithmetics for businessmen contains the first instance of using negative numbers in a medieval Islamic text.

He is also credited with compiling the tables of sines and tangents at 15' intervals. He also introduced the sec and cosec functions, as well studied the interrelations between the six trigonometric lines associated with an arc.[3] His Almagest was widely read by medieval Arabic astronomers in the centuries after his death. He is known to have written several other books that have not survived.

Life

He was born in Buzhgan, (now Torbat-e Jam) in Khorasan (in today's Iran). At age 19, in 959 AD, he moved to Baghdad and remained there for the next forty years, and died there in 998.[3] He was a contemporary of the distinguished scientists Abū Sahl al-Qūhī and Al-Sijzi who were in Baghdad at the time and others like Abu Nasr ibn Iraq, Abu-Mahmud Khojandi, Kushyar ibn Labban and Al-Biruni.[4] In Baghdad, he received patronage by members of the Buyid court.Template:Sfn

Astronomy

Abu Al-Wafa' was the first to build a wall quadrant to observe the sky.[4] It has been suggested that he was influenced by the works of Al-Battani as the latter describes a quadrant instrument in his Kitāb az-Zīj.[4] His use of tangent helped to solve problems involving right-angled spherical triangles, and developed a new technique to calculate sine tables, allowing him to construct more accurate tables than his predecessors.Template:Sfn

In 997, he participated in an experiment to determine the difference in local time between his location and that of al-Biruni (who was living in Kath, now a part of Uzbekistan). The result was very close to present-day calculations, showing a difference of approximately 1 hour between the two longitudes. Abu al-Wafa is also known to have worked with Abū Sahl al-Qūhī, who was a famous maker of astronomical instruments.Template:Sfn While what is extant from his works lacks theoretical innovation, his observational data were used by many later astronomers, including al-Biruni's.Template:Sfn

Almagest

Among his works on astronomy, only the first seven treatises of his Almagest (Kitāb al-Majisṭī) are now extant.[5] The work covers numerous topics in the fields of plane and spherical trigonometry, planetary theory, and solutions to determine the direction of Qibla.[4]Template:Sfn

Mathematics

He established several trigonometric identities such as sin(a ± b) in their modern form, where the Ancient Greek mathematicians had expressed the equivalent identities in terms of chords.[6]

sin⁡(α±β)=sin⁡αcos⁡β±cos⁡αsin⁡β

He also discovered the law of sines for spherical triangles:

Asin⁡a=Bsin⁡b=Csin⁡c

where A, B, C are the sides and a, b, c are the opposing angles.[6]

Some sources suggest that he introduced the tangent function, although other sources give the credit for this innovation to al-Marwazi.[6]

Works

  • Almagest (Kitāb al-Majisṭī).
  • "A Book on Those Geometric Constructions Which Are Necessary for a Craftsman", (Kitāb fī mā yaḥtaj ilayh al-ṣāniʿ min al-aʿmāl al-handasiyya).Template:Sfn
  • "A Book on What Is Necessary from the Science of Arithmetic for Scribes and Businessmen", (Kitāb fī mā yaḥtaj ilayh al-kuttāb wa’l-ʿummāl min ʾilm al-ḥisāb).Template:Sfn This is the first book where negative numbers have been used in the medieval Islamic texts.Template:Sfn

He also wrote translations and commentaries on the algebraic works of Diophantus, al-Khwārizmī, and Euclid's Elements.Template:Sfn

Legacy

The crater Abul Wáfa on the Moon is named after him.

Notes

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

References

External links

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Template:Persondata

  1. ↑ Template:Cite web
  2. ↑ "Iran" in USECO History of Humanity, ed. by M.A. Bakhit, Volume 4 of History of humanity : scientific and cultural development,UNESCO, 2000 pg 375: ""The science of trigonometry as known today was established by Islamic mathematicians. One of the most important of these was the Persian Abu'l Wafa Buzjani (d. 997 or 998), who wrote a work called the Almagest dealing mostly with trigonometry"" [1]
  3. ↑ 3.0 3.1 Template:MacTutor Biography
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