ASHORTWORK
Biblical Understanding based on the Record of Scripture
YHVH created the sun and the moon and set them in the heavens, in part, to show when to observe His Festivals. The date listed on this calendar for the start of the 1st month and the 7th month is based on the first projected sighting, after sunset, of the renewing of the light of the moon.
Exodus 23:14-17 NKJV
Three times you shall keep a feast to Me in the year:
You shall keep the feast of Unleavened Bread (you shall eat unleavened bread seven days as I commanded you, at the time appointed in the month of Abib, for in it you came out of Egypt; none shall appear before Me empty);
and the Feast of Harvest, the firstfruits of your labors which you have sown in the field; and the Feast of Ingathering at the end of the year, when you have gathered in the fruit of your labors from the field.
Three times in the years all your males shall appear before Adon Yehovah.