Muḥammad Abūʾl-Wafāʾ al-Būzjānī (10 June 940–997 or 998) was a distinguished Muslim astronomer and mathematician, who made important contributions to the development of trigonometry. He worked in a private observatory in Baghdad, where he made observations to determine, among other astronomical parameters, the obliquity of the ecliptic, the length of the seasons, and the latitude of the city. In honour of his astronomical work, a crater on the Moon was named for him. His 1073th anniversary falls this June 10th.
Abu al-Wafa al-Buzjanî
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Figure 1: Sarajevo skyline. (Source: http://www.skyscrapercity.com/showthread.php?t=597483&page=66).
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