Towards the Compilation of the Global Twilight Pattern

Ramza, Harry dan Sari, Zamah dan Bunyamin, Bunyamin dan Saksono, Tono dan Md Khir, Mohd Haris (2021) Towards the Compilation of the Global Twilight Pattern. Ulum Islamiyyah Journal, 33 (1). pp. 71-83. ISSN 1675-5936

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This paper summarizes ISRN’s 3-years research on the occurrence of dawn and dusk to mark the timings of the Fajr and Isha prayers. We acquired the astronomical data not only in Indonesia but also in Malaysia, the US, Egypt, and Turkey. It will be an attempt to compile a global twilight pattern in the future. The main instrument used is a Sky Quality Meter (SQM) that records the sky brightness data. For quality assurance, ISRN-UHAMKA employed dozens of imaging sensors ranging from an All Sky Camera, different types of DSLR, and gadget cameras. From hundreds of astronomical data, we have collected; it seems that the occurrence of the real twilight to mark the Fajr prayer throughout the world is the same. That is when the sun is at its depression angle of around 120-130. Likewise, the dusk to mark the end of the Maghrib prayer also occurs when the sun is at a solar depression angle around 120-130. Meanwhile, Muslims in the world use different solar depression angles ranging from -150 to 200 fields.

Item Type: Article
Subjects: T Technology > T Technology (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Fakultas Teknik > Teknik Elektro
Depositing User: Harry Ramza
Date Deposited: 18 Oct 2022 09:50
Last Modified: 18 Oct 2022 09:50

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