Putraga, Hariyadi, Observatorium Ilmu Falak, Universitas Muhammadiyah Sumatera Utara, Indonesia

• Vol 7, No 1 (2020): April 2020 - Articles
  Posisi matahari pada saat ekuinoks, summer solstice, dan winter solstice di observatorium ilmu falak Universitas Muhammadiyah Sumatera Utara
  Abstract  PDF

Jurnal Riset dan Kajian Pendidikan Fisika | Journal of Research and Physics Education Studies
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