The apostle Paul in the New Testament wrote to the saints at Colosse about the New Moon in chapter 2 of his epistle to the Colossians.

vs. 16 Let no man therefore judge you in meat, or in drink, or in respect of a Holy Day, or of the New Moon, or of the Sabbath:

vs. 17 Which are a shadow of things to come; . . .

This passage is one of the dearest in all Scripture to me as it was instrumental in bringing me to the truth of the law, Sabbath and Holy Days of YHVH.

The key is found in verse 17: "Which are a shadow of things to come". Under the New Covenant, when Paul was writing, these observances still ARE! The passage does not read "were", as is so frequently taught, and otherwise noted in commentaries. These times have not ceased. Don't let any man tell you that you don't have to be bothered with these observances (verse 8 identifies such men as worldly). These times are not a bother. The Scriptural record is that these are times of joy and celebration.

Follow the body of Mashiach in the observance of these blessed times. Please note that once again the New Moon is included right between Holy Day and Sabbath.

A return to the Old Testament will further the understanding of the New Moon with an examination of Scripture about trumpets.