New Delhi, April 18 -- Easter Sunday will be celebrated this year on April 20, 2025-but unlike Christmas or Independence Day, its date changes annually. This often raises a question among many - why does Easter move every year?

The answer lies in a blend of ancient tradition and astronomical calculation that dates back more than 1,600 years. Easter is what's known as a "moveable feast", and its date was formally established by the First Council of Nicaea in 325 AD.

According to the rule set by the Church, Easter falls on the first Sunday after the full moon that occurs on or after March 21, which is considered the fixed date of the spring equinox in the ecclesiastical calendar.

This means Easter can fall on any Sunday between March 22 ...