In ancient Israel, the Israelites used the moon to determine months. After the night of a no-moon, a new moon presented as a small sliver in the sky. This marked the beginning of a month. A full moon marked the middle.
To reiterate, YH is not dogmatic. While we seek to do right, we have no need to chastise other people or groups also seeking to do right. For example, we’re Tim Hegg fans! Yet, on this point we differ. Concerning the new moon, Hegg writes, “The method of intercalating was, from ancient times, a source of debate, and we know that various methods did evolve. That there are indications in the biblical text of a calendar by which months could be known is evident, for Jonathan knows that ‘tomorrow’ will be the new moon.”
To counter this logic, another thought leader has pointed out, “It has been suggested that the ancient Israelites could have looked at the ‘Old Moon’ and determined the Day of Conjunction by when the Old Moon was no longer visible in the morning sky. However, such a method would not work in the Middle East where the so-called “concealed moon” can remain concealed for as many as 3.5 days! It is in fact common for the moon to stay concealed for 2.5 days and in such instances how would the ancient Israelites have known which day was the Day of Conjunction?”
While YH has taken a “side,” the truth is it’s a work-in-progress. What’s more, we plan for congregational purposes. And again, we could not choose both viewpoints, though we readily recognize the valid points each side is making.
While YH sights the new moon for teaching/obedience purposes, to be aware of the seasons and so forth, we also recognize CA is not our true home. Rather, our eternal home is in Israel, the Promised Land.
Gen 12:1 “And Yahweh said to Abram, “Go forth from your land, And from your kin And from your father’s house, To the land which I will show you.”
For practical purposes, though we'll always try to "get it right," Yeshua’s House has determined the astronomical first sliver (new moon) in Israel is sufficient. Additionally, Yeshua’s House recognizes that “conjunction” (i.e., astronomical new moon) isn’t, necessarily, incorrect.