Sky brightness at twilight: detectors comparison between human eye and electronic device for PcPIUSHUĀ' & Subḥ from Islamic and astronomical considerations

Md. Shariff, Nur Nafhatun (2008) Sky brightness at twilight: detectors comparison between human eye and electronic device for PcPIUSHUĀ' & Subḥ from Islamic and astronomical considerations. Masters thesis, University of Malaya.

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Official URL: http://dspace.fsktm.um.edu.my/handle/1812/534

Abstract

The determination of Islamic prayer times has been extensively investigated thus this research offers critical insight of it. The author presents optical sky brightness at twilight measurements from May 2007 through April 2008 intermittently. After comprehend Islamic law code’s requirement, the measurement were done using human eye and electronic device (Sky Quality Meter) which is Sunnah (qualitative) and scientific (quantitative) approaches respectively. The measurement of twilight sky brightness were performed various sites covering east and west coast of Peninsular Malaysia. There are clear indications of changes of the receipt of light when Sun at certain degree below horizon that manifest itself by plateau in twilight sky brightness dependences versus solar zenith angle. Both data are in reasonable agreement with measurements previously made by Islamic scholars, although there are discrepancies. The author finds that the yearly averages of solar depression by observation are best correlated with the range of 17.3Po P– 19.5PoP and 17.5PoP – 20PoP for PcPIUshUĝ’ and Ṣubḥ respectively. Research understands these approaches have both tolerance and limitations in Islamic law code. The author can concludes with the recommendations for further research concerning extended research is required in order to gain certain level of accuracy.

Item Type: Thesis (Masters)
Subjects: Q Science > Q Science (General)
Depositing User: MS SITI NUR ATIKAH MOHAMAD RUSDI
Date Deposited: 31 Jul 2013 03:13
Last Modified: 31 Jul 2013 03:13
URI: http://repository.um.edu.my/id/eprint/1138

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