[goldbux]

Nisan is the first month of the Hebrew calendar [Passover].

Tishrei is the seventh month of the Hebrew calendar.

First day of Tishrei is Rosh Hashana, the start of the Hebrew new year.

Yes, the Hebrew new year starts in the seventh month of the calendar. This is confusing. Go figure.

Tenth day of Tishrei is Yom Kippur, the Day of Atonement.

Nisan is the seventh month after Tishrei, but only in a leap year, when a 30-day thirteenth month (an extra Adar, named Adar 1) is added to the calendar.

Tishrei, Cheshvan, Kislev [Chanukah], Tevet, Shevat, Adar, Adar 1, Nisan.

A leap year occurs about four times during a 13-year cycle.

[tang-soo]

This is because of this passage in Exodus Chapter 12

1) The Lord said to Moses and Aaron in the land of Egypt,

2 “This month shall be for you the beginning of months. It shall be the first month of the year for you.

This was spoken to Moses during the month of Nisan - the 7th month of the historical calendar. Tishri is the first month on the historical calendar. Rosh Hashannah means "The Head of the Year" or the beginning of the year.

For this reason, the Hebrew time is kept using two different calendars - the Secular/historical calendar and the Holy Calendar and they are exactly 6 months apart.

Also, there is a leap month inserted 7 leap months over the course of 19 years to realign ith lunar and solar calendars, This is why Hannukah falls sometimes 3 weeks before Christmas and sometimes is coincident with Christmas.