Spring full moon

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The spring full moon (church Latin: Luna XIV paschalis ) is the first full moon day in spring , which is calculated in advance ( called cyclically ) for setting the Easter date . It can deviate from the astronomical full moon day by one day. The first day of spring does not count as the astronomical beginning of spring , but regularly every year on March 21st of the Gregorian calendar . The astronomical beginning of spring can take place up to 3 days before March 21st. A cyclical full moon day these days is ignored. The next cyclical full moon day 30 days later is used.

Before the reorganization of the Easter bill associated with the calendar reform, there were 19 calendar days (between March 21 and April 18 in the Julian calendar ) for the spring full moon. According to the new regulation, there are certain 19 calendar days that are repeated after 19 years ( Meton cycle ), usually for only one century. After omitting a leap day at the turn of the century, there are 19 other very specific calendar days that recur every 19 years. Over a longer period of time, the 19-year scheme means that all days of a lunar period rounded up to 30 days (calendar days between March 21 and April 19 in the Gregorian calendar ) are eligible.

The spring full moon can fall on any day of the week . Easter is always on the following Sunday.

Web links

Individual evidence

  1. Nikolaus A. Bär: the calculation of the Easter date
  2. March 21st is the day of the beginning of spring to simplify the Easter calculation.
  3. The astronomical beginning of spring varies in the 21st century between 21st and 19th March (Gregorian calendar) despite the application of all additional leap year rules. Since 2007 the astronomical beginning of spring will only be again in the next century on March 21st. 2044 marks the first astronomical beginning of spring on March 19. From the end of the 49th century it can also be March 18th. Cf. Siegfried Wetzel: Alternatives to the Gregorian Calendar , Figures 1 u. 2  
  4. In every 19th year the difference to the next cyclical full moon is only 29 days, see Meton cycle.
  5. When evaluating April 19, however, exceptions come into force, see Easter date # The Easter bill in the Julian and Gregorian calendars .