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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 more...

What's New

Version 2.4.8:
  • I changed the initialization of the Venus dialog so that the popup menus will be initialized to the next rising/setting event for the current front inscription or if one is not open, to the next event after today.
  • I expanded the Venus Calculations section of the Methods of Calculating Maya Calendar Dates chapter in the help book to include more information about the more...


  • OS X 10.6.6 or later

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Current Version (2.x)


Downloads 13,973
Version Downloads 65
License Commercial
Date 27 Aug 2015
Platform Intel 64 / OS X
Price $9.99
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