Genesis 1:17. And God set them in the firmament of the heaven to give light upon the earth,
18 And to rule over the day and over the night, and to divide the light from the darkness: and God saw that it was good.
19 And the evening and the morning WERE THE FOURTH DAY.
Note: The Moon Was Created On The Fourth Day.
1 Samuel 20:24-27King James Version (KJV)
24 So David hid himself in the field: AND WHEN THE NEW MOON WAS COME, the king sat him down to eat meat.
25 And the king sat upon his seat, as at other times, even upon a seat by the wall: and Jonathan arose, and Abner sat by Saul's side, and David's place was empty.
26 Nevertheless Saul spake not any thing that day: for he thought, Something hath befallen him, he is not clean; surely he is not clean.
27 AND IT CAME TO PASS ON THE MORROW, WHICH WAS THE SECOND DAY OF THE MONTH, that David's place was empty: and Saul said unto Jonathan his son, Wherefore cometh not the son of Jesse to meat, neither yesterday, nor to day?
Note: The New Moon Was Kept On The First Day Of The Month
Psalm 81:3. Blow up the trumpet in the new moon, IN THE TIME APPOINTED, on our solemn feast day.
Note: New Moon Also Means New Month
Note: In What Time Did The Most High Appoint This Solemn Feast Day?
Psalm 81:4-5King James Version (KJV)
4 For this was a statute for Israel, and a law of the God of Jacob.
5 THIS ORDAINED IN JOSEPH for a testimony, WHEN HE WENT OUT THROUGH THE LAND OF EGYPT: WHERE I HEARD A LANGUAGE THAT I UNDERSTOOD NOT .
Note: This Solemn Feast Day Was Ordained When Israel Came Out Of Egypt.
1 Now WHEN JACOB SAW THAT THERE WAS CORN IN EGYPT, Jacob said unto his sons, Why do ye look one upon another?
2 And he said, BEHOLD, I have heard that THERE IS CORN IN EGYPT: get you down thither, and buy for us from thence; that we may live, and not die.
3 AND JOSEPH'S TEN BRETHREN WENT DOWN TO buy corn in EGYPT.
Note: Joseph's Brothers went into Egypt To Get CORN.
23 And THEY KNEW NOT THAT JOSEPH UNDERSTOOD THEM; for HE SPAKE unto them BY AN INTERPRETER.
Note: Joseph Spoke Unto His Brothers By An Interpreter
5 This he ordained in Joseph for a testimony, when he went out through the land of Egypt: where I heard a language that I understood not.
6 I REMOVED HIS SHOULDER FROM THE BURDEN: HIS HANDS WERE DELIVERED from the pots.
Note: When Were The Israelites Delivered from Egypt?
3 AND THEY DEPARTED FROM RAMESES IN THE FIRST MONTH, ON THE FIFTTEENTH DAY OF THE FIRST MONTH; on the morrow AFTER THE PASSOVER the children of ISRAEL WENT OUT with an high hand in the sight of all the Egyptians.
Note: Israel Departed From Egypt on The The Fifteenth Day Of The First Month.
Ecclesiasticus Chapter 43
6 He made the moon also to serve in her Season for a declaration of times, and a sign of the world.
7 From the moon is the sign of Feasts, a light that decreaseth in her perfection.
8 THE MONTH IS CALLED AFTER HER NAME, INCREASING wonderfully in her changing, being an instrument of the armies above, shining in the firmament of heaven;
Reminder: New Moon Also Means New Month
Note: A Full Moon Cannot Increase When It's Already In It's Perfection.
If you calculate months by the full Moon your season and feasts days will be off
Example Take The Holy Passover
It's held in the month Abib Exodus 13:4. This day came ye out in the month Abib.
Which means its a seasonal High Holy Day
Exodus 13:10. Thou shalt therefore keep this ordinance in his season from year to year.
Note: if you were to count based upon the full moon the month of Abib would still be in Winter.
and we know that the year does not begin in the Dead of Winter but the spring. Shalom