Each holy day is calculated based on the original lunar calendar described in the Torah.
The new year (Aviv 1) is calculated based on the ripening of the barley grain in the Land of Israel. Each new moon thereafter which is spotted in Israel marks the beginning of a new month (rosh chodesh).
Some of the dates below are subject to change based on the barley grain being ripe in time as well as the date on which new moons are actually visible in Israel with the naked eye.
A biblical day begins at evening and lasts until the following evening. Therefore, for the dates below, the day actually begins at sunset on the evening before the date listed.
|Passover Meal/1st Day of Feast of Unleavened Bread||March 29|
|First Fruits/Begin Counting the Omer||April 4|
|7th Day of the Feast of Unleavened Bread||April 4|
|Shavuot/Feast of Weeks||May 23|
|Yom Teruah/Day of Trumpets||September 9|
|Yom Kippur/Day of Attonement||September 18|
|Sukkot/Feast of Tabernacles||September 23|
|Shemini Atzeret/Last Great Day||September 30|