Solar and lunar calendar - has data sheets used in conjunction with movable disc to fix new moon or reference sunday in any past or future year

摘要

The calendar enables one to determine easily the past and future solar and lunar dates. The dominical letters are replaced by a reference Sunday and the Gregorian epacts derived from the "golden numbers", by a new moon, values which are carried on the sheets of the calendar. In the lower part of the sheets are the values for a century. The upper part gives the shifts of following centuries so as to condense the data. The tables on the sheets determine four parameters whose sun corresponds either to a Sunday or to a new moon. The positions of these on the discs enable one to determine all solar and lunar dates, past or future.