Observed in all Western Christian churches, Easter commemorates the Resurrection of Jesus. It is celebrated on the first Sunday after the full moon that occurs on or next after the vernal equinox (fixed at March 21) and is therefore celebrated between March 22 and April 25 inclusive. This date was fixed by the Council of Nicaea in A.D. 325.

A federal holiday observed the fourth Thursday in November by act of Congress (1941), it was the first such national proclamation issued by President Lincoln in 1863, on the urging of Mrs. Sarah J. Hale, editor of Godey's Lady's Book. Most Americans believe that the holiday dates back to the day of thanks ordered by Governor Bradford of Plymouth Colony in New England in 1621, but scholars point out that...