Feasts of the LORD

God gave Moses specific instructions regarding the calendar to follow. Without understanding this calendar, we will be missing out several things regarding the fulfillment of our Lord Jesus Christ. It is important to note, a complete day in God’s calendar is from evening to evening.

Note: The blue color is from LXX. The Temple icon is the requirement to appear before the Lord.

Date Scripture Notes
Abib
(first month)

Exod 12:2 “This month shall be your beginning of months; it shall be the first month of the year to you.

Exod 13:4 “On this day you are going out, in the month Abib.

First month is called Abib.
14 Abib

Passover:

Lev 23:5 ‘On the fourteenth day of the first month at twilight is the LORD’s Passover.
Passover.
15 Abib Unleavened Bread Begins:

Lev 23:6 ‘And on the fifteenth day of the same month is the Feast of Unleavened Bread to the LORD; seven days you must eat unleavened bread.
Feast of Unleavened Bread begins.
16 Abib

First Fruits:

Lev 23:10-11 “Speak to the children of Israel, and say to them: ‘When you come into the land which I give to you, and reap its harvest, then you shall bring a sheaf of the firstfruits of your harvest to the priest. He shall wave the sheaf before the LORD, to be accepted on your behalf; on the day after the Sabbath the priest shall wave it.

Lev 23:10-11 Speak to the children of Israel, and thou shalt say to them, When ye shall enter into the land which I give you, and reap the harvest of it, then shall ye bring a sheaf, the first-fruits of your harvest, to the priest; and he shall lift up the sheaf before the Lord, to be accepted for you. On the morrow of the first day the priest shall lift it up (LXX).
First fruits. It is also known as Feast of Harvest.

While Mesoretic text says  the day after the Sabbath, LXX clarifies the sabbath is representing the first day as per Lev 23:7.

21 Abib Unleavened Bread Ends:

Lev 23:6 ‘And on the fifteenth day of the same month is the Feast of Unleavened Bread to the LORD; seven days you must eat unleavened bread.
Feast of Unleavened Bread ends.
Ziv
(second month)

1Kgs 6:1 And it came to pass in the four hundred and eightieth year after the children of Israel had come out of the land of Egypt, in the fourth year of Solomon’s reign over Israel, in the month of Ziv, which is the second month, that he began to build the house of the LORD. Second month is called Ziv.
14 Ziv

Passover for the unclean:

Num 9:10-12 “Speak to the children of Israel, saying: ‘If anyone of you or your posterity is unclean because of a corpse, or is far away on a journey, he may still keep the LORD’s Passover. ‘On the fourteenth day of the second month, at twilight, they may keep it. They shall eat it with unleavened bread and bitter herbs. ‘They shall leave none of it until morning, nor break one of its bones. According to all the ordinances of the Passover they shall keep it.
Passover for the Unclean.
Sivan
(third month)
Esth 8:9 So the king’s scribes were called at that time, in the third month, which is the month of Sivan, on the twenty-third day; and it was written, according to all that Mordecai commanded, to the Jews, the satraps, the governors, and the princes of the provinces from India to Ethiopia, one hundred and twenty-seven provinces in all, to every province in its own script, to every people in their own language, and to the Jews in their own script and language.

Esth 8:9 So the scribes were called in the first-month, which is Nisan, on the three and twentieth day of the same year; and orders were written to the Jews, whatever the king had commanded to the local governors and chiefs of the satraps, from India even to Ethiopia, a hundred and twenty-seven satraps, according to the several provinces, according to their dialects. (LXX).

The 3rd month is called Sivan. However, LXX of the same verse suggests the event happened in 1st month (which is Nisan, a Babylonian name). Irrespective of 1st or 3rd, the focus here is just the name of the 3rd month which is Sivan.
10 or 11 Sivan Pentecost

Lev 23:15-16 ‘And you shall count for yourselves from the day after the Sabbath, from the day that you brought the sheaf of the wave offering: seven Sabbaths shall be completed. Count fifty days to the day after the seventh Sabbath; then you shall offer a new grain offering to the LORD.
Pentecost. 50 days from 21 Abib.
Ethanim
(seventh month)
1Kgs 8:2 Therefore all the men of Israel assembled with King Solomon at the feast in the month of Ethanim, which is the seventh month. Seventh month is called Ethanim
1 Ethanim Trumpets:

Lev 23:24 “Speak to the children of Israel, saying: ‘In the seventh month, on the first day of the month, you shall have a sabbath-rest, a memorial of blowing of trumpets, a holy convocation.
Trumpets
10 Ethanim Day of Atonement:

Lev 23:27 “Also the tenth day of this seventh month shall be the Day of Atonement. It shall be a holy convocation for you; you shall afflict your souls, and offer an offering made by fire to the LORD.
Day of Atonement
15 Ethanim

Feast of Tabernacles Begins:

Lev 23:34-36,39 “Speak to the children of Israel, saying: ‘The fifteenth day of this seventh month shall be the Feast of Tabernacles for seven days to the LORD. On the first day there shall be a holy convocation. You shall do no customary work on it. For seven days you shall offer an offering made by fire to the LORD. … Also on the fifteenth day of the seventh month, when you have gathered in the fruit of the land, you shall keep the feast of the LORD for seven days; on the first day there shall be a sabbath-rest, and on the eighth day a sabbath-rest.
Feast of Tabernacles begins. It is also known as Feast of Ingathering or Feast of Completion as per LXX. 
22 Ethanim Feast of Tabernacles Ends:

Lev 23:36 ‘For seven days you shall offer an offering made by fire to the LORD. On the eighth day you shall have a holy convocation, and you shall offer an offering made by fire to the LORD. It is a sacred assembly, and you shall do no customary work on it.

Feast of Tabernacles ends