The date of Easter is determined from the Moon and the position of the Earth in its orbit !
For western christians, Easter is the Sunday following the first full moon during or after the spring equinox, that is to say according to the definition established by the Council of Nicaea in 325.
According to this definition, Easter falls between March 22 and April 25 of each year.
Pope Gregory XIII decided on October 4, 1582 to switch to the Gregorian calendar (still in use today) and immediately skip 10 days to move from October 4 to October 15. The Eastern Churches have retained the Julian calendar, leading to a different date for Easter in most cases.
For Orthodox Christians, Easter is celebrated between April 4 and May 8 at the latest.
In 2026, Easter Day is April 6 in France, Orthodox Easter Day is April 12.
On 19 April, the young Moon visits the Pleiades cluster in the constellation of Taurus, above the setting sun, followed by Venus on April 24.