Najm al-Mulk and the evolution of geography and astronomical calendars during the Qajar era

Geography and astronomy are among the oldest and most widely practiced sciences that have continued to exist in modern times, and have always been associated with medicine. In astronomy, this association extends to astronomical calendars and the prediction of the most and least favorable occasions for the treatment of diseases. In the geographical context, it includes health and human diseases connected with environmental factors, and has developed with time into what is known today as medical geography.
Najm al-Mulk, the royal astronomer to the court of Naser al-Din Shah, was the first Iranian teacher and author of geography and astronomy in Dar ul-Fonun to promote these sciences, and was responsible for writing the traditional calendar. The aim of this study was to examine the evolution of geography and astronomy during the Qajar era. For this purpose, we investigated astronomical calendars and historical books, and examined the association of traditional medicine with geography and astronomy while inspecting the role of Najm al-Mulk in the process.