The Implication of Sky Quality Meter Technology in Observing the Dawn To Determine Subh Prayer Time

Maskufa, Maskufa; Munazat, D.R.; Damanhuri, Adi; Shomad, Ahmad Abd.

doi:10.4108/eai.2-10-2018.2295598

Cited by 1 publication

(2 citation statements)

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“…Sky Quality Meter (SQM) is a simple and very easy to use photometric tool for measuring sky brightness levels. SQM is produced by Unihedron, and has been widely used for sky quality mapping research [23], [24] determine astronomical site [25], [26] , light pollution research [25], [27]- [29] research in the health sector [28] , behavioural research birds [30], [31] , to research on determining the time prayer [2], [8], [13], [15] . SQM uses a light frequency sensor TSL237, SQM in this study is set to quantify in mpsas every 1 minute with the direction of the sensor to the zenith [32].…”

Section: Sky Quality Metermentioning

confidence: 99%

“…The sun's elevation angle below the horizon, which indicates the presence of dawn, also indicates the beginning of subuh prayer time. In Indonesia, the elevation angle of the Sun used for the beginning of subuh prayer time is -20° or zenith=110° [2], lately this standard has been questioned because it is assumed that when the Sun is in that position, the dawn light on the western horizon has not yet appeared. Dawn light research has been carried out with various approaches, some using the naked eye [3] , using a digital camera [4][5] , and some using simple photometric tools, namely Sky Quality Meter (SQM) [2], [6]- [8].…”

Section: Introductionmentioning

confidence: 99%

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Ideal Data to Determine Accurate Fajr Time

Damanhuri¹,

Mukarram²

2022

J. Mat. Mantik

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Early fajr time research was carried out by various parties with various techniques, one of which was using a sky quality meter (SQM) photometric tool. Observational data from various regions that have varying night levels result in a varying early fajr time as well. By paying attention to the effect of sky quality represented by the night level at the observation location, this research wants to answer whether the 20 mpsas night level limit is ideal data by looking at the correlation coefficient between night level and the turning point solution. From 1068 data with varying night levels, the correlation coefficient ( ) between the night level and the turning point solution is 0,42 which means there is an effect, while for data with a minimum night level of 20mpsas the correlation coefficient is 0,07 which means there is no influence. Based on the results of the analysis, the night level of 20mpsas can be the minimum limit for conducting an ideal early fajr time research. From 241 ideal observation data from 6 LAPAN observation stations, early fajr time presents when the Sun's elevation angle is -16,51°. Early fajr time is also the beginning of subuh prayer time, with its standard used in Indonesia, which is -20° or 3,49° different from the analysis results, if it is converted there is a difference of 13 minutes 57 seconds.

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