OBSERVATION OF DAWN SPECTRAL SHIFTS: TRANSITION FROM FAJAR KAẐIB TO FAJAR ṢADIQ IN DETERMINING THE BEGINNING OF FAJR PRAYER TIME AT THE UIN WALISONGO OBSERVATORY SEMARANG
DOI:
https://doi.org/10.31958/jisrah.v5i2.13701Kata Kunci:
Fajr, RGB Intensity, Islamic AstronomyAbstrak
This research analyzes the color change from false dawn (fajar kaẑib) to true dawn (fajar ṣadiq) in determining the beginning of the Fajr prayer time at the UIN Walisongo Observatory in Semarang. A camera, adjusted to match visual perception, was used to record RGB intensity at regular intervals. Results indicate a significant increase in the red spectrum as true dawn appears, distinct from false dawn. Comparative analysis of RGB ratios, moving averages, and linear fitting identified a pattern of change and an inflection point at a solar altitude of -19.81° or 04:00 WIB, which reliably detects the transition between the two dawns. This method offers a more precise alternative for determining the Fajr prayer timeReferensi
Ardi, U. S. (2020). Problematika Awal Waktu Shubuh antara Fiqih dan Astronomi. AL – AFAQ, 2(2), 87–102. https://doi.org/10.20414/afaq.v2i2.2921
Azhari, S. (2017). Awal Waktu Shalat Subuh di Dunia Islam. Al-Mazaahib, 5(2), 236–248. https://doi.org/10.14421/al-mazaahib.v5i2.2858
Basthoni, M. (2022). Efek Polusi Cahaya terhadap Penentuan Awal Waktu Subuh di Indonesia. (Disertasi) Universitas Islam Negeri Walisongo Semarang, 99–196. https://eprints.walisongo.ac.id/id/eprint/19165/
Huda, Muchammad Azkal. (2023). Pengukuran Kecerahan Langit di Observatorium UIN Walisongo Menggunakan Sky Quality Meter (SQM). (Skripsi) Universitas Islam Negeri Walisongo Semarang, 126–127. https://eprints.walisongo.ac.id/id/eprint/20563/
Sado, A. B. (2015). Waktu Shalat dalam Perspektif Astronomi: Sebuah Integrasi antara Sains dan Agama. Jurnal Muamalat, 7(1), 69–83. https://journal.uinmataram.ac.id/index.php/muamalat/article/view/1169
Setyanto, Hendro. (2021). Zodiacal Light Detection Based on Sky Quality Meter (SQM) Data: Preliminary Study. Al-Hilal: Journal of Islamic Astronomy, 3(2), 121–134. https://doi.org/10.21580/al-hilal.2021.3.2.8477
Utari, D. (2014). Studi Analisis Awal Waktu Shalat Shubuh (Kajian Atas Relevansi Nilai Ketinggian Matahari Terhadap Kemunculan Fajar Shadiq). Maqasid, 3(1). https://doi.org/10.30651/mqsd.v3i1.1394
Wahidin, N. W. (2023). Analisis Variasi Kriteria Awal Waktu Subuh di Indonesia terhadap Pelaksanaan Ibadah Salat dan Puasa. Jurnal Elfalak, 7(1), 45–64. https://doi.org/10.24252/ifk.v7i1.38760
Azhari, S. (2017). Awal Waktu Shalat Subuh di Dunia Islam. Al-Mazaahib, 5(2), 236–248. https://doi.org/10.14421/al-mazaahib.v5i2.2858
Basthoni, M. (2022). Efek Polusi Cahaya terhadap Penentuan Awal Waktu Subuh di Indonesia. (Disertasi) Universitas Islam Negeri Walisongo Semarang, 99–196. https://eprints.walisongo.ac.id/id/eprint/19165/
Huda, Muchammad Azkal. (2023). Pengukuran Kecerahan Langit di Observatorium UIN Walisongo Menggunakan Sky Quality Meter (SQM). (Skripsi) Universitas Islam Negeri Walisongo Semarang, 126–127. https://eprints.walisongo.ac.id/id/eprint/20563/
Sado, A. B. (2015). Waktu Shalat dalam Perspektif Astronomi: Sebuah Integrasi antara Sains dan Agama. Jurnal Muamalat, 7(1), 69–83. https://journal.uinmataram.ac.id/index.php/muamalat/article/view/1169
Setyanto, Hendro. (2021). Zodiacal Light Detection Based on Sky Quality Meter (SQM) Data: Preliminary Study. Al-Hilal: Journal of Islamic Astronomy, 3(2), 121–134. https://doi.org/10.21580/al-hilal.2021.3.2.8477
Utari, D. (2014). Studi Analisis Awal Waktu Shalat Shubuh (Kajian Atas Relevansi Nilai Ketinggian Matahari Terhadap Kemunculan Fajar Shadiq). Maqasid, 3(1). https://doi.org/10.30651/mqsd.v3i1.1394
Wahidin, N. W. (2023). Analisis Variasi Kriteria Awal Waktu Subuh di Indonesia terhadap Pelaksanaan Ibadah Salat dan Puasa. Jurnal Elfalak, 7(1), 45–64. https://doi.org/10.24252/ifk.v7i1.38760
##submission.downloads##
Diterbitkan
2024-08-31
Terbitan
Bagian
Articles
Lisensi
Hak Cipta (c) 2024 Muhammad Said Fadhel, Balkis Sifara Alawiya
Artikel ini berlisensi Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Authors who publish with this journal agree to the following terms:- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a?áCreative Commons Attribution License?áthat allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See?áThe Effect of Open Access).
