AMAJIDA, Shafira. The Systematic Implications of the Hijri Calendar in the Caliph Umar bin Khattab’s Period for the Present. AL - AFAQ : Jurnal Ilmu Falak dan Astronomi, [S. l.], v. 7, n. 1, p. 57–66, 2025. DOI: 10.20414/afaq.v7i1.11449. Disponível em: https://journal.uinmataram.ac.id/index.php/afaq/article/view/11449. Acesso em: 22 apr. 2026.