Passover was and is celebrated according to God's command (Exodus ch. 12).
Passover in 1963 started on Tuesday, April 9th. In Israel, Passover is seven days, Outside of Israel, it is eight days.
Passover commemorates the Exodus from Egypt, but no one knows exactly when or where it was first celebrated as a holiday. If it's as old as the event it commemorates, it was most likely first celebrated in Israel.
The Seder is eaten the first two nights of Passover outside of Israel, and the first night in Israel.
Passover.
In Israel it lasts seven days, and in the diaspora (out of Israel) it lasts eight days.
The Passover dinner that is eaten the first night of Passover in Israel, and the first two nights outside of Israel is called the Seder
Passover begins on Saturday evening, April 19, with the first Seder. The last day of Passover in Israel is Saturday April 26, and outside of Israel is Sunday, April 27. It is unusual for Passover to begin immediately following Shabbat.
Passover is a 7 day holiday in Israel and 8 day holiday outside of Israel. On the first night in Israel and first two nights outside of Israel, Jews read the story of the Exodus from the Haggadah.
The 1st passover was in Egypt.
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Passover ends the evening of Tuesday, April 26th in 2011 (Diaspora) In Israel passover ends the evening of Monday 25th April 2011
2 Chronicles 35:16-19 (NKJV) So all the service of the Lord was prepared the same day, to keep the Passover and to offer burnt offerings on the altar of the Lord, according to the command of King Josiah. And the children of Israel who were present kept the Passover at that time, and the Feast of Unleavened Bread for seven days. There had been no Passover kept in Israel like that since the days of Samuel the prophet; and none of the kings of Israel had kept such a Passover as Josiah kept, with the priests and the Levites, all Judah and Israel who were present, and the inhabitants of Jerusalem. In the eighteenth year of the reign of Josiah this Passover was kept.