Garry,

Your point about there always being 1260 days between is important.

Critical moments in Israel's history have, and apparently will continue to happen in relation to the feast days.

Also, the 1260 days is referred to frequently, either as 1260 days, or 42 months, or 3½ years.

What I have wondered about is something mentioned in Daniel:

Daniel 12:11 And from the time that the daily sacrifice shall be taken away, and the abomination that maketh desolate set up, there shall be a thousand two hundred and ninety days.

The 1290 days would include an extra month.

The Hebrew calendar has an extra month of Adar, for the leap year, 7 times in 19 years.

I understand that some would say that this practice was not prescribed in the scriptures, and therefore rejected.

However, the practice is ancient, and apparently does not disagree with the scriptures.

Leviticus 23:10 Speak unto the children of Israel, and say unto them, When ye be come into the land which I give unto you, and shall reap the harvest thereof, then ye shall bring a sheaf of the firstfruits of your harvest unto the priest:

also:

Leviticus 23:39 Also in the fifteenth day of the seventh month, when ye have gathered in the fruit of the land, ye shall keep a feast unto the LORD seven days: on the first day shall be a sabbath, and on the eighth day shall be a sabbath.

With a purely lunar calendar, like the muslims use, these feasts would sometimes end up in the middle of winter.

The agricultural growing seasons follow a solar cycle rather than a lunar cycle.

So, both Firstfruits and Tabernacles, described in Leviticus 23, expect to be lined up with the agricultural growing seasons.

The LORD created the heaven and the earth, and the seasons are also the work of his hand.

So, could the extra month mentioned in Daniel 12:11, result from an extra month of Adar?