*** w90 2/15 pp. 14-15 From Seder to Salvation ***
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Another reason why our date may differ from that of the Jews is that they employ a predetermined calendar, which system was not fixed until the fourth century C.E. Using this, they can set dates for Nisan 1 or for festivals decades or centuries beforehand. Moreover, the ancient lunar calendar needed to have a 13th month added occasionally so that the calendar would synchronize with the seasons. The current Jewish calendar adds this month at fixed points; in a 19-year cycle, it is added to years 3, 6, 8, 11, 14, 17, and 19.
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However, Emil Schürer says that "at the time of Jesus [the Jews] still had no fixed calendar, but on the basis of purely empirical observation, began each new month with the appearance of the new moon, and similarly on the basis of observation" added a month as needed. "If . . . it was noticed towards the end of the year that Passover would fall before the vernal equinox [about March 21], the intercalation of a month before Nisan was decreed." (The History of the Jewish People in the Age of Jesus Christ, Volume 1) The extra month thus comes in naturally, not being added arbitrarily.
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The Governing Body of Jehovah?s Witnesses establishes the date for the Lord?s Evening Meal in line with the ancient method. Nisan 1 is determined by when the new moon nearest the spring equinox can likely be observed at sunset in Jerusalem. Counting 14 days from that brings one to Nisan 14, which usually corresponds to the day of the full moon. (See The Watchtower of June 15, 1977, pages 383-4.) On the basis of this Biblical method, Jehovah?s Witnesses around the globe have been advised that the celebration of the Memorial this year will be after sunset on April 10.
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This date corresponds to Nisan 14, which was when Jesus held the last valid Passover. However, celebrating the Memorial brings into focus salvation beyond what the Jewish Seder commemorates. All of us need to understand what takes place during the Lord?s Evening Meal, what it means, and how our salvation is involved.