Marwadi, M. and Mughni Labib 2025. Saadoe’ddin Djambek’s Thoughts on Calculating the Beginning of the Hijri Month. QISTHOSIA : Jurnal Syariah dan Hukum. 6, 1 (Jul. 2025), 81–98. DOI:https://doi.org/10.46870/jhki.v6i1.1515.