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All Journal Ulul Albab: Jurnal Studi dan Penelitian Hukum Islam Afkaruna: Indonesian Interdisciplinary Journal of Islamic Studies Intiqad: Jurnal Agama dan Pendidikan Islam YUDISIA : Jurnal Pemikiran Hukum dan Hukum Islam Heritage of Nusantara: International Journal of Religious Literature and Heritage MIQOT: Jurnal Ilmu-ilmu Keislaman MAHKAMAH: Jurnal Kajian Hukum Islam JIPFRI (Jurnal Inovasi Pendidikan Fisika dan Riset Ilmiah) Titian Ilmu: Jurnal Ilmiah Multi Sciences SPEKTRA: Jurnal Kajian Pendidikan Sains Jurnal Environmental Science MUST: Journal of Mathematics Education, Science and Technology Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) Jurnal Pendidikan Islam Jurnal SOLMA Al-MARSHAD: Jurnal Astronomi Islam dan Ilmu-Ilmu Berkaitan ORBITA: Jurnal Pendidikan dan Ilmu Fisika Jurnal Dinamika Sosial Budaya Journal of Contemporary Islam and Muslim Societies Idrak: Journal of Islamic Education Al-Hikmah: Jurnal Agama dan Ilmu Pengetahuan IJISH (International Journal of Islamic Studies and Humanities) Jurnal Kumparan Fisika Journal of Islam and Science Indonesian Review of Physics (IRiP) Ihsan: Jurnal Pengabdian Masyarakat Jurnal Ilmu Pemerintahan, Administrasi Publik, dan Ilmu Komunikasi (JIPIKOM) ELFALAKY: Jurnal Ilmu Falak Maslahah: Jurnal Pengabdian Masyarakat Al-Fikru: Jurnal Ilmiah International Journal of Community Service Proceeding International Seminar of Islamic Studies Al-Hilal: Journal of Islamic Astronomy Al-Afaq: Jurnal Ilmu Falak dan Astronomi Tsaqila Jurnal Pendidikan dan Teknologi Edu Society: Jurnal Pendidikan, Ilmu Sosial dan Pengabdian Kepada Masyarakat Jumantara: Jurnal Manuskrip Nusantara INJURITY: Journal of Interdisciplinary Studies DIKTUM: JURNAL SYARIAH DAN HUKUM Astroislamica: Journal of Islamic Astronomy QANUN: Journal of Islamic Laws and Studies Heritage of Nusantara: International Journal of Religious Literature and Heritage Jurnal Ilmu dan Inovasi Fisika Jurnal Pendidikan Islam Wahana Fisika : Jurnal Fisika dan Terapannya Azkayra: Jurnal Pengabdian Masyarakat dan Sosial Al-Ahkam: Jurnal Ilmu Syari'ah dan Hukum JIPFRI (Jurnal Inovasi Pendidikan Fisika dan Riset Ilmiah)
Arwin Juli Rakhmadi
Universitas Muhammadiyah Sumatera Utara
Religion Arts Humanities Astronomy Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Physics Public Health Social Sciences Other

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The Sun's Vertical Depression Effect on True Dawn: A Visual Observation Study Hariyadi Putraga; Arwin Juli Rakhmadi; Ahmad Abdulwfa
Astroislamica: Journal of Islamic Astronomy Vol. 5 No. 1 (2026): Astroislamica: Journal of Islamic Astronomy (June)
Publisher : Islamic Astronomy Department, Sharia and Law Faculty

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47766/astroislamica.v5i1.7573

Abstract

This study aims to analyze the influence of the Sun's vertical depth on the appearance of true Dawn in Medan City using the naked-eye observation method. Observations in Medan show that the true dawn light first appears when the Sun is at a depression angle of −14° to −12° below the eastern horizon. The difference between the visible true Dawn and the official dawn time (-20°) is about 6°. These results are consistent with more than 30 studies conducted across over 10 countries at various latitudes, utilizing approximately five different monitoring methods. These results confirm the need to correct the dawn time based on local observations and actual sky conditions, so that the determination of the time of worship better aligns with astronomical reality.
Pengukuran Kecerahan Langit Malam dan Polusi Cahaya di Provinsi Sumatera Utara Putraga, Hariyadi; Rakhmadi, Arwin Juli; Firdaus, Muhammad Dimas; Hidayat, Muhammad
Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) 2022: Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) 2022
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/prosidingsnfa.v7i0.71953

Abstract

Abstract: The astronomical phenomenon that occurs at a certain time and duration becomes objects for study and research. However, not every location provides the astronomical phenomenon visibility that observers want. To achieve the best data, the best observer position is also needed. During the author’s experience pursuing astronomical phenomena around North Sumatra, only a few places provide good visibility. This is related to the night sky brightness level and light pollution of the location. The night sky brightness is a variable that needed to be included to determine the location used for astronomical observation points so the observers could get the best results. The measurement was taken using a photometer named Sky Quality Meter in several locations around North Sumatra to find the best sky brightness data value reading. From the measurements, the maximum reading results for the East coast of North Sumatra is 19.39 MPSAS, for mid-North Sumatra 20.92 MPSAS, and for the West coast was 21.87 MPSAS. The location with the best night sky brightness quality and the lowest light pollution is the West coast of North Sumatra.Abstrak: Fenomena astronomi yang terjadi pada waktu dan durasi tertentu menjadi salah satu objek kajian dan penelitian. Namun, tidak semua lokasi memberikan keterlihatan fenomena astronomi seperti yang diinginkan pengamat. Untuk mendapatkan data dengan kualitas terbaik, diperlukan pula lokasi pengamat terbaik. Dalam perjalanan penulis mengejar fenomena astronomi di sekitar Sumatera Utara, hanya beberapa tempat saja yang memberikan hasil keterlihatan dengan baik. Hal ini terkait dengan tingkat kecerahan langit malam dan tingkat polusi cahaya di lokasi tersebut. Kecerahan langit malam merupakan salah satu variabel yang perlu dimasukkan dalam penentuan lokasi pengamatan astronomi agar pengamat bisa mendapatkan hasil terbaik. Pengukuran yang dilakukan menggunakan sebuah fotometer yaitu Sky Quality Meter di beberapa lokasi untuk mendapatkan data kecerahan langit malam di sekitar Sumatera Utara. Dari pengukuran yang dilakukan, didapatkan hasil maksimal untuk pesisir timur Sumatera Utara adalah 19,39 MPSAS, pertengahan Sumatera Utara adalah 20,92 MPSAS, dan untuk pesisir Barat adalah 21,87 MPSAS. Maka lokasi dengan kualitas kecerahan langit malam terbaik dan polusi cahaya paling rendah berada sekitar pesisir Barat Sumatera Utara.
Co-Authors Abu Yazid Raisal Ahmad Abdulwfa Ajraini Nazli Ajraini Nazli Amrizal Amrizal Amrizal Amrizal Andika, Muhammad Sadam Cemda, Abdul Rahman Fanreza, Robie Firdaus, Muhammad Dimas Ginting, Nurman Gunawan Gunawan Habibullah Ritonga Hariyadi Putraga Hasrian Rudi Setiawan Hermawan, Leo Hidayat, Muhammad Ida Hanifah Ismail Ismail Isra Hayati Khair, Alfath Leo Hermawan Marataon Ritonga Mario Kasduri Muhammad Dimas Firdaus Muhammad Dimas Firdaus Muhammad Hidayat Muhammad Qorib Nasution, Makromatul afifah Nor Azam bin Mat Noor Panjaitan, Nur Nilam Sary Pasaribu, Munawir Pradesyah, Riyan Radiman Radiman Radiman, Radiman Rangkuti, Ahmad Zuhri Riskiyan Hadi Robby Pamungkas Robie, Fanreza Ruslandi Ruslandi Sinaga, Roynanda Thariq, Muhammad Zailani Zailani Zailani, Zailani Zebua, Marfirah Syam