113 VOL. 1 NO. 1 JANUARI-JUNI 2017 KAJIAN ILMU FALAK DI INDONESIA: Kontribusi Syekh Hasan Maksum dalam Bidang Ilmu Falak Arwin Juli Rakhmadi Butar-Butar Universitas Muhammadiyah Sumatera Utara, Indonesia Jl. Kapten Mucthar Basri No. 108-112, Sumatera Utara e-mail: arwin_buntupane@yahoo.co.uk Abstract: The Study of Astronomy in Indonesia: Shaykh Hasan Maksum’s Contribution to Astronomy. Islamic scholars have played a role for the strengthening and preservation of Islamic scholarship in Indonesia, including in Astronomy. Unfortunately, works on this field have not been studied accordingly. This article examines the contribution of Shaykh Hasan Maksum, a very influential mufti on Deli Sultanate in East Sumatra. Like many other Nusantara scholars, he studied in Haramain (Makkah and Madinah) for a substantial time. This article studies his work, Natîjah Abadiyah, applying Content Analysis. It is clear that the Natijah Abadiyah is a short yet very important for it contains daily prayer timetable and some necessary explanations. Keywords: Indonesia, East Sumatera, Astronomy, Hasan Maksum JOURNAL OF CONTEMPORARY ISLAM AND MUSLIM SOCIETIES VOL. 1 NO. 1 JANUARI-JUNI 2017