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Chac is a complete, accurate Maya calendar application. It 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.

You can use a large range of correlation constants, any one of the six possible moon numbers, astronomical or historical dating, any of the four Year Bearer systems and appearance of the

What's New

Version 2.5.3:
  • This update contains a minor bug fix and a small change to the text fields in the eclipse and Venus panels.


  • OS X 10.6.6 or later

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Chac User Discussion

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Current Version (2.x)


Downloads 14,044
Version Downloads 5
License Commercial
Date 13 Oct 2016
Platform Intel 64 / OS X
Price $9.99
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