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is still used for fixing the date of Easter,
the number of the year in Melon’s cycle be-
ing the golden number of our prayer-books.
Melon’s system divided the 235 lunations
into months of thirty days and omitted ev-
ery sixty-third day. Of the nineteen years,
twelve had twelve months and seven had
thirteen months.
Callippus (330 B.C.) used a cycle four
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