eprintid: 17224 rev_number: 11 eprint_status: archive userid: 2950 dir: disk0/00/01/72/24 datestamp: 2022-10-18 09:50:33 lastmod: 2022-10-18 09:50:33 status_changed: 2022-10-18 09:50:33 type: article metadata_visibility: show creators_name: Ramza, Harry creators_name: Sari, Zamah creators_name: Bunyamin, Bunyamin creators_name: Saksono, Tono creators_name: Md Khir, Mohd Haris creators_id: hramza@uhamka.ac.id creators_id: zamahsari@uhamka.ac.id creators_id: bunyamin@uhamka.ac.id creators_id: tonosaksono@uhamka.ac.id creators_id: harisk@utp.edu.my creators_orcid: 0000-0002-4126-8797 contributors_type: http://www.loc.gov/loc.terms/relators/AUT contributors_type: http://www.loc.gov/loc.terms/relators/AUT contributors_type: http://www.loc.gov/loc.terms/relators/AUT contributors_type: http://www.loc.gov/loc.terms/relators/AUT contributors_type: http://www.loc.gov/loc.terms/relators/AUT contributors_name: Ramza, Harry contributors_name: Sari, Zamah contributors_name: Bunyamin, Bunyamin contributors_name: Saksono, Tono contributors_name: Md Khir, Mohd Haris contributors_id: hramza@uhamka.ac.id contributors_id: zamahsari@uhamka.ac.id contributors_id: bunyamin@uhamka.ac.id contributors_id: tonosaksono@uhamka.ac.id contributors_id: harisk@utp.edu.my corp_creators: Department of Electrical Engineering, Universitas Muhammadiyah Prof. Dr. HAMKA, Jakarta, INDONESIA corp_creators: Islamic Science Research Network, Universitas Muhammadiyah Prof. Dr. Hamka corp_creators: Islamic Science Research Network, Universitas Muhammadiyah Prof. Dr. Hamka corp_creators: Department of Electrical Engineering, Universitas Muhammadiyah Prof. Dr. HAMKA, Jakarta, INDONESIA corp_creators: Department of Electrical and Electronic Engineering, Faculty of Engineering, Universiti Teknologi Petronas title: Towards the Compilation of the Global Twilight Pattern ispublished: pub subjects: T1 subjects: TK divisions: 20201 abstract: 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. date: 2021-04-25 date_type: published publisher: USIM PRESS official_url: https://uijournal.usim.edu.my/index.php/uij/article/view/269/209 full_text_status: public publication: Ulum Islamiyyah Journal volume: 33 number: 1 pagerange: 71-83 refereed: TRUE issn: 1675-5936 related_url_url: https://uijournal.usim.edu.my/index.php/uij/article/view/269 related_url_type: author referencetext: Abdulla, F. M., Calculating the variations of sunrise, sunset and day length times for Baghdad city.With comparison to different regions of the world in year 2019. Iraqi Journal of Science 2019, 60 (12), 2732-2741. Admiranto, A. G.; Haida, S. K.; Priyatikanto, R.; Maryam, S.; Ellyyani; Suryana, N., Mobile Campaign of Sky Brightness Measurement in Indonesia. Journal of Physics: Conference Series 2020, 1523, 012002. Baarda, W., A Testing Procedure for the Use in Geodetic Network. 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In Measuring Light Pollution with a Calibrated High Dynamic Range All-Sky Image Acquisition System, DARKSKY 2007: 7th European Symposium for the Protection of the Night Sky, Bled, Slovenia, International Dark Sky Association: Bled, Slovenia, 2007; pp 1-22. funders: Universitas Muhammadiyah Prof. Dr. HAMKA, Indonesia citation: 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 document_url: http://repository.uhamka.ac.id/id/eprint/17224/1/Towards%20the%20Compilation%20of%20the%20Global%20Twilight%20Pattern.pdf