"Easter Sunday falls on the first Sunday following the first full moon after the vernal equinox. The vernal equinox is fixed as March 21, making March 22 the earliest possible date for Easter Sunday."
"According to the lunar calendar, the latest possible date for a full moon after March 21 is April 18, meaning Easter Sunday never falls later than April 25."
"To calculate the date of Easter for any given year, one must know the distribution of weekdays across calendar dates and the corresponding lunar phases for each day."
"Carl Friedrich Gauss created a formula to determine the date of Easter mathematically, which is remarkably simple: 22 + d + e, where this sum corresponds to the date in March."
Easter Sunday is determined by the first Sunday after the first full moon following the vernal equinox, which is fixed on March 21. The earliest possible date for Easter is March 22, while the latest is April 25. Western Christians use the Gregorian calendar for this calculation, while Eastern Christians use the Julian calendar. Mathematically, the date can be calculated using a formula identified by Carl Friedrich Gauss, which simplifies the process of determining Easter's date each year.
Read at www.scientificamerican.com
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