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All Journal Dimas: Jurnal Pemikiran Agama untuk Pemberdayaan Al-Ihkam: Jurnal Hukum dan Pranata Sosial Physics Education Research Journal Al-Hilal: Journal of Islamic Astronomy MIYAH: Jurnal Studi Islam Astroislamica: Journal of Islamic Astronomy Al-Mabsut: Jurnal Studi Islam dan Sosial
M. Ihtirozun Ni’am
Universitas Islam Negeri Walisongo Semarang
Religion Humanities Astronomy Earth & Planetary Sciences Economics, Econometrics & Finance Education Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Physics Social Sciences Other

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Correlation Between Hilal Age and Altitude at the Beginning of the Lunar Month (A Critique of the Calculation System in Fath ar-Rauf al-Mannan) Rahma; M. Ihtirozun Ni'am
Astroislamica: Journal of Islamic Astronomy Vol. 3 No. 2 (2024): Astroislamica: Journal of Islamic Astronomy (Desember)
Publisher : Islamic Astronomy Department, Sharia and Law Faculty

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47766/astroislamica.v3i2.3369

Abstract

The hilal altitude formulation in the book Fath ar-Rauf al-Mannan is 0.5 of its age value. However, in the practice of modern theory, the calculation of hilal altitude is not that simple but uses a complex formulation of spherical trigonometry. Therefore, it is necessary to conduct research related to the correlation of hilal age and altitude at the beginning of the lunar month to determine the relationship between the two variables as a criticism of the Fath ar-Rauf al-Mannan hilal altitude formulation. The approach used is quantitative with the type of library research. This research uses data on the new moon at the beginning of the lunar month in 1444 H for twelve months (coordinates 6°59'30" N and 110°20'53" E). The hilal age (x variable) and altitude (y variable) were analyzed using simple regression resulting in a correlation equation y = 0.444103449 x – 0.34109308. The result shows that the hilal altitude formulation in the book Fath ar-Rauf al-Mannan is not representative enough, so it has the potential to cause errors in predicting the hilal position. 
Dinamika Penentuan Awal Bulan Kamariah Nahdatul Ulama: sebelum dan sesudah adanya formulasi kriteria imkan rukyat Afifah Mulya Alamsyah; Muhammad Ihtirozun Ni’am
Astroislamica: Journal of Islamic Astronomy Vol. 4 No. 1 (2025): Astroislamica: Journal of Islamic Astronomy (Juni)
Publisher : Islamic Astronomy Department, Sharia and Law Faculty

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47766/astroislamica.v4i1.5241

Abstract

Nahdatul Ulama is a large Islamic organisation in Indonesia that has many people and is engaged in religious sosial affairs. In NU, there is a special Lajnah that deals with phalactic issues, namely Lajnah Falakiyyah Nahdatul Ulama. However, the determination made by NU initially only used Rukyat which of course invited discourse on determining the beginning of the month using rukyat and imkanrukyat. This research has a formulation of how Nahdatul Ulama before and after the existence of imkanrukyat and aims to find out how NU addresses the determination of the beginning of the Kamariah month, especially before and after the existence of Imkan ar Rukyat in Indonesia and how the paradigma of determining the beginning of the Kamariah month which was originally only three months in a hijri year, then changed to every month in a hijri year. This type of research is library research. And it is concluded that Nahdatul Ulama as an Islamic organisation is an organisation that is very open to change as long as it does not violate the Islamic Aqidah, and in LFNU itself there is a dynamic paradigma. Of course the changes in the determination of the beginning of the month changed, when before the imkanrukyat LFNU was only based on rukyat alone, and rukyat was carried out only in three major months, then after the Imkan appeared, rukyat was carried out in six major months, and then became every beginning of the Hijri month.
Co-Authors Abdul Mufid Achmad Azis Abidin Afifah Mulya Alamsyah Akhmad Nadirin Alfian Qodri Azizi Apriana Apriana Dwi Oktarini Fika Afhamul Fuscha khabib suraya Lalu Muhammad Abdi Zamakhsyari luayyin luayyin Muh. Arif Royyani Muhammad Fiki Burhanuddin Muhammad Najib Nizma Nur Rahmi Nurkhanif, Muhammad Prastyo, Irman Said Rahma Youla Afifah Azkarrula