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Coordinates of Piri Reis map This short article is taken from the full article which is available here as a PDF file The discovery of a new continent, America, through the efforts to reach India by sailing around the Cape of Good Hope motivated great...
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Sevim Tekeli is Emeritus Professor, History of Science Department at Ankara University, a student of Professor Aydin Sayili. This article is based on her answers in a brief interview conducted recently by Dr Salim Ayduz. I was born in Izmir in 1924. I completed my primary education in various...
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Figure 1. A depiction of the Maragha Observatory. This short article is taken from the full article (by Prof. Sevim Tekeli) which is available here as 53 page PDF file. This article includes the critical edition and the translation of the Risala fî...
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Table of Contents   The First Maps Drawn by the Japanese Acknowledgement of Japan in Maps Drawn by Europeans The World Map of Mahmud of Kashgar in the Eleventh Century Who is Mahmud of Kashgar? Divânu Lügati't-Türk References Note of...
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Sevim Tekeli* It is easy to obtain the lengths of cords of certain arcs. The formulas needed are Cord 2A, Cord A/2, Cord (A±B). Even by applying all these formulas, it is not possible to get the Cord 1o or Cord 2o. Ptolemy (ca 150 CE) used an ingenious method of interpolation.(2) He added the...
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by Prof. Sevim Tekeli* Contents Introduction "Astronomical Instruments of Tycho Brahe and Taqi al-Din" by Sevim Tekeli. Four hundred years ago, an observatory located at Tophane, on the European side of Bosporus, famous as Istanbul Observatory, was founded by Taqî al-Dîn al-Râsid, under...
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