Creation Calendar Information
Genesis, chapter 9, states God's covenant after the flood with Noah and his seed after him. Also notice God's instructions to Noah and his sons in verse 1: "And God blessed Noah and his sons, and said to them, Be fruitful, and multiply, and replenish the earth." (KJV)
Adam and Noah had a growing season just as we do today. They understood how the sun warmed the ground to make plants grow to sustain life and replenish the earth. Adam and Noah had no Rabbi, no Sanhedrin, no Bible College, no traditions, no base 60 numerical system of Babylon, no equator, etc.
Adam and Noah talked face to face with God and had the council of God and the lights (sun and moon) of his creation. The sun cast a shadow then just as it does today. By using the shadow, we can locate the equinox (equal dark and equal light) as the sun will do this automatically. This will give us a starting point for the solar year and keep us in step with creation. We need to understand this before we apply Leviticus 23.
The above feast dates are based on Jerusalem, Israel time zone location. They will keep us in step with creation without an intercalated or inserted new moon that was not divided by the sun and moon.
Day = sunset to sunset, (at the absence of direct sunlight when the sun sets below the horizon).
Week = seven complete days with the seventh day a Sabbath.
New moon = starts when the moon becomes dark at the first absence of direct sunlight, like the day.
Equinox = the original Latin definition, about 1350-1400 A.D.: "the time of equal days and nights."
Solar year = starts with the equinox divided by the sun and moon at Jerusalem.
Passover = occurs when the dark new moon will put the 14th day in the new solar year.
Symbolic Wave Sheaf = after the weekly Sabbath on Sunday during the Days of Unleavened Bread.
Pentecost = count 50 days from the date of symbolic Wave Sheaf, which will be on a Sunday.
Count from the Abib 1 dark new moon date, to the seventh dark new moon date to set the rest of God's feasts in the seventh month. All God's festivals are counted from the first dark new moon date to the seventh dark new moon date which are divided by the sun and moon.