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International Journal of Scientific and Engineering Research
ISSN Online 2229-5518
ISSN Print: 2229-5518 8    
Website: http://www.ijser.org
scirp IJSER >> Volume 3,Issue 8,August 2012
Sky Brightness for Determination of Fajr and Isha Prayer by Using Sky Quality Meter
Full Text(PDF, )  PP.132-134  
Author(s)
Siti Asma' Mohd Nor, Mohd Zambri Zainuddin
KEYWORDS
— prayer time, sun altitude, sky brightness, twilight, astronomical twilight,magnitude
ABSTRACT
Study of sky brightness was done during night twilight and morning twilight at Teluk Kemang, Negeri Sembilan, Pantai Cahaya Bulan, Kelantan and Kuala Terengganu, Terengganu. This study was done to ensure the time for beginning and ending of astronomical twilight are the same as the theory. Astronomical twilight is used to determine the beginning and ending of Fajr and Isha prayer time. Sky quality meter were used in this study to observe the sky brightness. The finding shows that the darkest the sky can go is to less than 20 mag per meter square in the morning (Subh) while in the night the sky can goes dark until less than 21mag per meter square. This data can be related to the sun altitude which is the condition to determine the time of beginning of Fajr and Isha prayer.
References
[1]H. Z. Zadeh, Prayer Times Calculation, (2007).

[2] Unit Falak Bahagian Penyelidikan JAKIM, Kaedah Panduan Falak Syarie (2001).

[3] A. H. Sultan, Sun Apparent Motion and Salat Times, (2004) al-Irshaad Vol.8.

[4] N. Hajewaming, Astronomucal Calculation of Islamic Times and Qilat Direction, 33rd Congress on Science and Technology of Thailand.

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