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All Journal Al-Afaq: Jurnal Ilmu Falak dan Astronomi Muẚṣarah: Jurnal Kajian Islam Kontemporer
Ahmad Izzuddin
Universitas Islam Negeri Walisongo
Humanities Astronomy Earth & Planetary Sciences Education Law, Crime, Criminology & Criminal Justice Social Sciences

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OPTIMIST AND PESSIMIST MOON-SIGHTING: THE STUDY OF ISLAMIC CALENDAR DETERMINATION IN INDONESIA Ahmad Adib Rofiuddin; Ahmad Izzuddin
Muẚṣarah: Jurnal Kajian Islam Kontemporer Vol. 4 No. 2 (2022): Desember
Publisher : UIN ANTASARI BANJARMASIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18592/msr.v4i2.7543

Abstract

The Islamic calendar decision has always been a public discourse among Muslims at the beginning of Ramadan, Shawwal, and Dhulhijjah. It is often the case that different decisions made among Muslim groups in determining the first of Ramadhan, Syawal, and Dhulhijjah which will affect the public holiday in Muslim majority countries. This study incorporates the theory of limit proposed by Muhammad Syahrour to analyze the ongoing contestation of Islamic calendar determination. Based on the in-depth analysis, this study suggests that the height criteria of the crescent can be categorized as optimistic and pessimistic criteria. Crescent's altitude of 3 degrees is the lower limit of optimism in crescent observations. Pessimism can be seen from astronomical calculations in which hilal altitude is below 3 degrees. These two criteria could be supported by the existing scientific proof through the image of the hilal altitude below 3 degrees.
Canopus sebagai Anggota Bintang Terbaru Zij al-Sultani Ulugh Beg dan Rujukan Penentuan Arah Kiblat Muhammad Said Fadhel; Ahmad Izzuddin
AL - AFAQ : Jurnal Ilmu Falak dan Astronomi Vol. 5 No. 2 (2023): Desember 2023
Publisher : Universitas Islam Negeri Mataram

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Abstract

Zij al-Sultani was written by Ulugh Beg in 1437 AD , that is a connection with the constellation catalog in the medieval century after the book of Fix Stars by al-S?ufi. This star catalog contains comparisons in addition to several stars that are not indexed inside the book of Fixed Star. It is far known that there are twenty-seven stars updated by Ulugh Beg in Zij al- Sult?a?ni. One of the twenty-seven stars is used to determine the direction of the Qibla for some areas of Islam. The Andalusians used Canopus, a member of the constellation Carina, to determine the direction of the Qibla. In the end, this paper is expected to be a guide to look back at the journey of hisab rukyat and Islamic astronomy. That idea not only to supporting find renewal within the development of Islamic astronomy also encourages understanding comparisons between the classical books inside the medieval century. Currently, just a little discussion may be discovered concer this catalog of Zij al-Sult?a?ni by Ulugh Beg.
Co-Authors Ahmad Adib Rofiuddin Muhammad Said Fadhel