The New Moon celebration began the new month that went from new moon to new moon. The length of time between new moons is approximately 29.5 days and orders God’s holy calendar.

“David answered Y’honatan, “Look, tomorrow is Rosh-Hodesh, and I ought to be dining with the king. Instead, let me go and hide myself in the countryside until evening of the third day” (1 Samuel 20:5).