Passover starts on the 15th day of the Jewish month of Nissan. This varies by year since the Jewish year is a luni-solar year and thus differs from the Gregorian calendar. It always falls in the springtime, though (in the Northern Hemisphere).
Also: Jewish holidays always begin at sundown.
I'm assuming you mean to ask what determines the date of Passover, the festival known to Jews as Pesach.
Pesach's dates are fixed - it always begins on the 15th day of the Hebrew month of Nisan. However, as the Hebrew calendar is based upon a combination of both lunar and solar cycles rather than just solar cycles as is the secular calendar, any particular Hebrew date will not correspond to the same secular date in two consecutive years. For example, in 2011 15 Nisan corresponded to 18 April, in 2012 it will correspond to 6 April. This frequently leads those who either do not understand the Hebrew calendar or are unaware that it exists to assume that it falls on different dates and must therefore be subject to some process by which its dates are determined.
In earlier times, things were a little more complicated as it was decided that Nisan could not start until the barley was ripe (as it will be at this time of year in Israel) so as to ensure that Pesach remained a Spring festival. Thus, if conditions had not allowed it to ripen by the expected date, an extra intercalary month known as Adar 2 would be added and would continue for however long was necessary for the barley to ripen so that Nisan could begin, However, this was largely abandoned some 1500 years ago and since then the beginning of Nisan has been determined mathematically.
Passover starts on the 15th day of the Jewish month of Nissan. This varies by year since the Jewish year is a lunar year and thus differs from the Gregorian calendar. It always falls in the springtime, though (in the Northern Hemisphere).
Passover 2008 begins on April 20 (actually, it begins at sundown on April 19, since Jewish holidays always begin at sundown of the night before).
It always starts on the same day each year: the 14th of the month of Adar. To find this date on the Gregorian calendar you would have to look at a Jewish calendar or use a Hebrew Calender converter online.
This your, 2009, passover starts on April 9 (Technically on the evening of April 8).
The holiday of Passover is celebrated 15-22 Nisan on the Hebrew calendar. When these dates sync on the Western calendar determines when the holiday occurs.
calculator dumby
I think Easter is the following Sunday after Passover.
In 2013, Passover began on the evening of March 25th.
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April 23rd...
passover 60ad
Passover always begins on the same date on the Hebrew calendar: the 14th of Nissan.
In 1998, April 11th was Shabbat and also the first day of Passover. It happens, but not very often.
Monday, March 29th at Sundown.
March 25 - April 2 in 2013.
Jews still celebrate Passover to this day.
As soon a passover ends, leavened foods are again permissible, subject to other general kosher laws.
The fourteenth of Nissan (Numbers ch.9).