Will Easter fall on the Spring Equinox in 1999, and how often does that happen?

Nope. The earliest possible date for Easter is March 22, and the latest possible date for the Spring Equinox is March 21. In 1999, spring arrives on March 21, and Easter will happen on April 4. In the years, 1598, 1693, 1761, 1818, 2285 and 2353, Easter happened/will happen on March 22.

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All answers are provided by Dr. Sten Odenwald (Raytheon STX) for the
NASA IMAGE/POETRY project.