Ideal Data to Determine Accurate Fajr Time

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