Principal Contact

Marataon Ritonga

Observatorium Ilmu Falak
University of Muhammadiyah North Sumatra .

217 Denai St, Post Graduate Building 7th Floor, Medan City, Indonesia. Postal Code: 20226.

Phone: 085358033907
Email: marataonritonga@umsu.ac.id

Support Contact

Al-Hisab Journal
Email: alhisabjournal@umsu.ac.id