Mind if I step in, The Scripture states, that no man knows the day or hour, of the coming of Our Lord, Right! But Paul writes, I have no need to write unto you Brethren about the Time, and Season's, for you know them. These were Jew's that live out these very Feast's year after year, from childhood, OK, They would watch the Lunar Cycle, it starts as the moon appears in the west just after sundown, a sliver, the first sliver of the moon, dictates the beginning of each month! So starting with the month of the Aviv, month 1, then they count each new moon, until the seventh month, Here's the kicker! they do not know when each month's new moon will appear! The Only Feast that Begin's just as the new moon is sighted, is Day of Trumpet's, so no man know's the day or the hour in which it will be sighted. They know about when to watch, but there is no Guarantee! Once the Day of Trumpet's is established, then on the 10th Day, it is Day of Atonement, then on the 14th Day we have Tabernacles, which last 8 days. the first day is a high Sabbath, and the last day is a high Sabbath.
1 Day of Trumpet's - the Last Trump - when those that sleep are raised. and those that are still alive, in a twinkling of an eye!
2 Day of Atonement - When We [Hopefully] are on the Sea of fire and glass, during the bowls of Wrath being poured out, [Like Noah we are above the Judgment of God]
Tabernacles - for 8 day we will celebrate in the Booth's as they did when they came out of Egypt, and the Last Day will be the Marriage to the Lamb, and We {Hopefully} will Tabernacle with the King Forever!
Know there will be some that correct me, and that's OK, I may not have it perfect, But Close. Just a general overview !!!!!!!!!!!!