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All Journal Al-MARSHAD: Jurnal Astronomi Islam dan Ilmu-Ilmu Berkaitan
Habibullah Ritonga
Universitas Islam Sumatera Utara
Astronomy Education

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Peran Ilmu Falak Dalam Masalah Arah Kiblat, Waktu Salat dan Awal Bulan Habibullah Ritonga; Arwin Juli Rakhmadi Butar-Butar
Al-Marshad: Jurnal Astronomi Islam dan Ilmu-Ilmu Berkaitan Vol 2, No 2 (2016)
Publisher : University of Muhammadiyah Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (606.721 KB) | DOI: 10.30596/jam.v2i2.2549

Abstract

Ilmu falak adalah disiplin ilmu yang mengkaji tentang benda-benda langit, khususnya bulan dan matahari. Bagi umat Islam, ilmu falak berperan setidaknya dalam tiga hal yaitu (1) menentukan waktu-waktu salat, (2) menentukan arah kiblat, dan (3) menentukan awal bulan qamariyah, khususnya dalam menetapkan puasa dan hari raya. Tiga hal ini merupakan persoalan ijtihad yang membuka ruang perbedaan pendapat berdasarkan cara telaah dan argumentasi masing-masing.
Fenomena Hari Tanpa Bayangan Bulan Maret di Kota Medan Habibullah Ritonga
Al-Marshad: Jurnal Astronomi Islam dan Ilmu-Ilmu Berkaitan Vol 5, No 1 (2019)
Publisher : University of Muhammadiyah Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (344.064 KB) | DOI: 10.30596/jam.v5i1.3124

Abstract

A day without shadows is a day when the sun is right above (zenith), objects that are perpendicular to the sun and the entire plane of matter will be parallel to the direction of sunlight, so the object will not form a shadow around the object. This phenomenon occurs along with the artificial journey of the sun every year from south to north and vice versa from north to south. The sun will transit right above (zenith) cities in Indonesia. For the city of Medan, the phenomenon of days without bans is estimated to occur twice a year, namely every March 29 and October 2. This phenomenon occurs at midday, when the declination of the sun reaches 03 ° 34 ', equal to the value of the latitude of the city of Medan (03 ° 34' LU).
Co-Authors Arwin Juli Rakhmadi