This paper summarizes ISRN's 3-years research on the occurrence of dawn and dusk to mark the timings of the Fajr and Isha prayers. We acquired the astronomical data not only in …
Sebagai tempat pengamatan astronomi, Observatorium Ilmu Falak Universitas Muhammadiyah Sumatera Utara (OIF UMSU) membutuhkan kualitas langit malam yang …
Light pollution is a growing concern in the world. It affects many walk of lives, including human health, the degradation of nocturnal animal habitat, and the inability of the …