Jun 1906
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1906natur..74..200t&link_type=abstract
Nature, Volume 74, Issue 1913, pp. 200 (1906).
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Scientific paper
THE discrepancy between the date of Easter, 1954, April 18 as given by the tables in the Book of Common Prayer, and April 25 as given by the formula of Gauss, arises from a purely artificial contrivance of Clavius, who arranged the reformed calendar, which is thus described on p. 55 of ``The Prayer Book Interleaved,'' 1873, in an account of the calendar founded on a paper by Prof. De Morgan:-``It will never happen as to mean lunations, and rarely as to real ones, that in the same cycle there should be the lunation of a given month beginning on the same day in two different years of the cycle; and such a thing never happened in the unreformed Calendar. Clavius thought it desirable to imitate this in the new Calendar; and he observed that by taking the preceding day whenever the Epact was xxv., and the year of the cycle after the 11th, he could avoid the reiteration, and thus make the desired resemblance.'' ``Whenever the Epact should be xxv., the year of the cycle being upwards of 11, say that the Epact is 26. This is not an astronomical correction, but a mere conventional mode of reconciling the choice which Clavius made of the mode of writing the Epacts with an essential peculiarity of the old cycle of 19 years which that mode of writing would have otherwise destroyed.'' ``In 1954 the Golden Number is 17, the Sunday letter C, and the Epact according to the ordinary rule, xxv. Call it therefore xxvi. Thence April 17 will be the 14th day of the Paschal Moon, April 18, Easter Day. If the Epact xxv. were used April 25 would be Easter Day.'' The paper by Prof. De Morgan will be found in the ``Companion to the British Almanac'' for 1845.
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