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.
Leviticus 23:20-21 NKJV
The Priest shall wave them (the sacrifices) with the bread of the firstfruits as a wave offering before Yehovah, with the two lambs. They shall be holy to Yehovah for the Priest.
You shall proclaim on the same day that it is a holy convocation to you. You shall do no customary work on it. It shall be a statute forever in all your dwellings throughout your generations.