Article Per Year (5 Year)
p-Index From 2021 - 2026
0.23
P-Index
This Author published in this journals
All Journal Astroislamica: Journal of Islamic Astronomy
Ahmad Abdulwfa
National Research Institute of Astronomy and Geophysics (NRIAG)
Religion Astronomy

Published : 1 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 1 Documents
Search

 1 
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.
Co-Authors Arwin Juli Rakhmadi Hariyadi Putraga