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There are two Hebrew calendars: 1) the civil calendar and 2) the religious calendar. The Hebrew CIVIL calendar begins with the month of Tishri. The Hebrew RELIGIOUS calendar begins with the month of Nisan.

Don't worry! It's not really confusing at all. Look at the below picture (of the Hebrew calendar); it goes clockwise. Nisan is the 1st month on the RELIGIOUS calendar and the 7th month on the CIVIL calendar (in a non-leap year), whereas Tishri is the 1st month on the CIVIL calendar and the 7th month on the RELIGIOUS calendar (in a non-leap year).

Another thing to know is that every third year on the Hebrew is usually a leap year in which a 13th month (called Second Adar) is added between (first) Adar and Nisan. To be precise, Second Adar is added every every 3rd, 6th, 8th, 11th, 14th, 17th, and 19th year of a 19 year lunar cycle.

It is also important to know that every individual year on the Hebrew calendar corresponds to two years on the Gregorian calendar and vice versa. This is because the Hebrew year and the Gregorian year do not begin at the same time.

This still may not make sense yet. Don't worry! The Gregorian new year begins in January and the Hebrew (civil) calendar begins with Tishrei (about 3/4 months prior to January). For example, the Gregorian year 2006 corresponds to the Hebrew years: 5565 (the later part) & 5567 (the earlier part).

The most basic and also the most important thing to note is that a day begins at sundown and ends about 24 hours later at sundown.