The Islamic crescent moon, or "hilal syar'i" in Indonesian, refers to the crescent moon reported by lunar observers without accompanying photographic or video evidence (astronomical crescent). This legal issue makes rukyat cannot be abandoned enigszins though hisab (astronomical calculation) has advanced significantly. Hisab serves as a tool to support rukyat. https://guide-to-major-public-hol29024.jts-blog.com/29836129/de-5-seconden-trick-voor-indonesian-national-holidays