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Chac is a complete, accurate Maya calendar application.

Chac can find Maya calendar dates based on today's date, any date, a Long Count, Tzolk'in, Haab', Calendar Round, Julian day number, distance number, long reckoning , seatings in the cycle of God K and convert between the Julian and Gregorian calendars. Chac can find the next heliacal or cosmical rising or setting of Venus and the visibility of the current inscription or date

Chac calculates the day of the week, Gregorian or Julian date, Julian day number, the Year Bearer, cycle of God K, Long Count, Tzolk'in, Haab', nine Lords of the Night, lunar deity, moon more...

What's New

Version 2.4.6:
  • Changed the Venus Panel so that the text field will display the visibility of Venus of the front Inscription, or if there is not one open, of the current date.
  • Edited the Help book.
  • Minor changes to the graphical user interface.


  • OS X 10.6.6 or later

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Current Version (2.x)


Downloads 13,628
Version Downloads 129
License Commercial
Date 16 Nov 2014
Platform Intel 64 / OS X
Price $9.99
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