Why is this night different from all other nights? Wednesday, 12 April 2006 08:27:43 CDT David-Braverman Weather (0) Because Passover begins at sundown. Use the Weather Now sunrise calculator to figure out exactly when that is. (It's 7:25pm in Nashua, 7:29pm in Chicago, and 7:39pm in Monterey, Calif., for those keeping score at home.)