Putraga, Hariyadi

• INSIS 2 (January 2021) - Articles
  THE FALAK SCIENCE OBSERVATORY OF UNIVERSITY OF MUHAMMADIYAH NORTH SUMATRA (OIF UMSU) AND THE CONTRIBUTION IN FAJR TIME RESEARCH
  Abstract  PDF
• INSIS 3 (February 2022) - Articles
  DESIGN OF REMOTING TELESCOPE IN OBSERVATORIUM ILMU FALAK UNIVERSITAS MUHAMMADIYAH SUMATERA UTARA
  Abstract  PDF
• INSIS 5 (March 2023) - Articles
  ZIJ ULUGH BEK AND HIS INFLUENCE ON ISLAMIC ASTRONOMY DEVELOPMENT IN NUSANTARA
  Abstract  PDF