<span class="mceitemhidden"><span lang="IN">The indication of began to enter the shubuh prayer time is when emerge the morning dawn and lasted until the sun rises. The sun</span></span><span class="apple-converted-space"><span lang="IN"> </span></span><span class="hiddensuggestion"><span lang="IN">position</span></span><span class="apple-converted-space"><span lang="IN"> </span></span><span class="mceitemhidden"><span lang="IN">when emerge the morning dawn is below the intrinsic horizon marked with a minus sign (-) with the value of a certain height. The Ministry of Religious Affairs has set the sun altitudes of dawn in the shubuh prayer time with minus (-) 19°+ sunrise/sunset altitudes as standard is the reference time of dawn prayers in Indonesia. However, this provision in fact reap discourse in some quarters because it is not</span></span><span class="apple-converted-space"><span lang="IN"> </span></span><span class="hiddengrammarerror"><span lang="IN">in accordance with</span></span><span class="apple-converted-space"><span lang="IN"> </span></span><span class="mceitemhidden"><span lang="IN">the phenomenon of morning dawn emergence at the beginning of the shubuh prayer time empirically. This study aims to decide the morning dawn, as the beginning of dawn determinant</span></span><span class="mceitemhidden"><span lang="IN">.</span></span><span class="apple-converted-space"><span lang="IN"> </span></span><span class="mceitemhidden"><span lang="IN">The tool used in this study is the Sky Quality Meter (</span></span><span class="hiddenspellerror"><span lang="IN">SQM</span></span><span class="mceitemhidden"><span lang="IN">), to detecting the morning dawn emergence as a sign of the beginning of the shubuh prayer time. The results of this study found that the brightness of the sky throughout the night or the morning dawn in</span></span><span class="apple-converted-space"><span lang="IN"> </span></span><span class="hiddenspellerror"><span lang="IN">Tayu</span></span><span class="apple-converted-space"><span lang="IN"> </span></span><span class="mceitemhidden"><span lang="IN">Beach,</span></span><span class="apple-converted-space"><span lang="IN"> </span></span><span class="hiddenspellerror"><span lang="IN">Pati</span></span><span class="mceitemhidden"><span lang="IN">, Central Java, in the span of four days of observation that is at 4: 31 </span></span><span class="mceitemhidden"><span lang="EN-GB">a.m</span></span><span class="mceitemhidden"><span lang="IN"> with an average altitude of the sun is -17°(17°below the horizon)</span></span><span class="mceitemhidden"><span lang="IN">.</span></span>

One of the ideal criteria for an observatory is the location that is related to its influence on the condition of the night sky. The observatory area is a light pollution-free area, far from the city or urban center. This is intended to get a dark night environment so the observations can be done well. The e-Maya Observatory is one of the observatories in Indonesia that located in Subang, West Java. Established in 2013, the observatory’s work is relatively new in Astronomy field in Indonesia. This observatory was built in the area of Astha Hannas Subang High School which is about 18 km to the north from the center of Subang city. To find out the quality of the night sky and how big the impact of city lighting or the level of light pollution in the e-Maya Observatory area, it is necessary to measure the brightness of the night sky. Measurement of the night sky brightness used a simple sky brightness photometer, Sky Quality Meter (SQM), there are two SQM types used, SQM LU and SQM LU-DL. SQM measures the brightness value of the night sky in magnitude per squared arcseconds (mag/arc sec2) all night on August 11-14, 2018 towards the east and west horizons with the slope angle of 30° (z = 60°) and pointed to zenith (z = 0°).