Easter fall in the year 21. april. But many sharp readers may have noticed, that it should fall 24. march.
It writes Science.dk.
the Tradition is that easter falls the first Sunday after the first full moon after the spring equinox.
How has it been since the rule was defined at the council of Nicaea (the present Turkish city of Iznik) in the year 325.
It does, just not in years. This year the full moon after the spring equinox on the 21. march, and the following Sunday is 24. march. But if you check your calendar, it says clearly that easter Sunday is 21. april.
– There are several reasons why it goes wrong in the year. Overall, one can say that our calendar follows the sun, and the do not always fit completely together with the lunar cycle, says Claus Jørgen Clausen, ph.d. in arkæoastronomi, there is an intersection between archaeology and astronomy, to Science.dk.
When it was summoned to the council of Nicaea in the year 325 by the roman emperor, Constantine the Great, was it decided when easter should fall.
But the assembly also took a decision that forårsjævndøgnet always falls on the 21. march.
Forårsjævndøgnet is the time when the sun stands directly above the equator.
the Problem is just that forårsjævndøgnet not always fall on the same day. In the year and for the next many years, for example, 20. march.
– It gives problems when forårsfuldmånen in year 21. march. Previously, it has made it really difficult to know whether there really had been the full moon after the forårsjævndøgnet, and then you may have missed the real full moon, and waited on the next, says Claus Jørgen Clausen.
the Problem with the inaccurate observations were taken up in the year 1800, when the German mathematician Carl Friedrich Gauss made an algorithm that could take the passover without the use of observations. But even his algorithm can get to count the wrong moon.
Some years is forårsjævndøgnet and the full moon so close to the next full moon will be taken instead. It is the case in the year in which forårsjævndøgnet for example is the 20. march and the full moon rises on the night of 21. march at. 02:43.
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