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This program contains a lot of features about the mayan calendar and astronomy.

You have the possibility to convert dates from gregorian into mayan calendar and vice versa or between several parts of the mayan caledar system. To build a complete inscription date you have to determine the lord of the night and the age of the moon. Often you can read on stelae date distances values which you can also verify with my software.
The range where the most calculations take place strech over three epochs, each of them having 13 baktuns.