A Leap Year.

My exhibition is about leap year, but before I'll(gr.) start to talk about the Leap Year, I must explain to you why it is happening(gr. - happens)
Well, there are three options for counting the year
One option is the Sidereal Year:

This is the time that gets(ww.) the earth orbiting the sun.
The sidereal year is made up of 12 months of 30 or 31 days. (which)
Sum(s) up of(to) 365 days(a year).

The second option is the Moon-Year.

The moon year is made up of 12 months of 29 or 30 days, (summing up to).
Sum up of 354 days. (a year).

The third option is the reason for the leap year .
This is the Jewish way for the calendar(phr.):
This calendar is the combination of the other two options I just wrote about.
Because of this combination we need to balance the calendar, so, we add 10 more days every year ...or what's happening at the leap year(phr. - or, as a whole month every 3 years, as it is done on a leap year)
Add one month every 3 years. Every month is the time the moon is orbiting the earth.

So like we talked about(As I mentioned before,), the leap year is the time when we add one more mounth for(ww. - to) the year, this is the time when we balance the Sidereal year with the Moon-year. The extra month that we add to the leap year is the Adar..(month).
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the reason for this is becase(מיותר) the difference between the ancient calendar and the modern calendar of today; the difference is the names of the months, and the order of the months.
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In the ancient times there were no names for the months, they were called "month 1" "month 2" atc(etc. or and so on). In the ancient calendar the first month was the spring month, in Hebrew "Nisan", and the first holy day was the(מיותר) Passover in Hebrew "Pesah", and the last month was "Adar" not "Ellul"…so that’s why every leap year they added another is Adar, and not Ellul.
And this is also the best way to make sure that the(מיותר) Passover and Nosan will be in the spring. - Your explanation is very messy and not very clear. You'll have to go over it again.


http://he.wikipedia.org/
http://lib.cet.ac.il/Pages/item.asp?item=6168