September 2020
Page 10

Cylinder Dials in the History of Ottoman Astronomy

Explores the terminology and history of cylinder dials ("al-ustuwana", "‘Asâ-yı Mûsâ") in the Ottoman Empire, where they were less common than astrolabes. Introduces two Ottoman manuscripts and discusses two surviving cylinder dials from the 18th and 19th centuries, both calculated for the latitude of Istanbul (41°).
Dials: Portable, How Sundials Work, Mathematics of Dialling, Historical Dials

Gaye Danişan