This year Fat Tuesday lands on March 5. Last year Mardi Gras was celebrated nearly a whole month earlier on Tuesday, Feb. 13. So why isn’t Mardi Gras celebrated on the same date every year?
How that date is calculated involves math, astronomy and religion.
Because Easter isn’t always on the same date every year, Mardi Gras, the eve of the Lenten season for many in Christianity, changes from year t…
