Thank you for your review

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 2.7.2:
  • Added code that improves the handling of the Venus and zenith passage panels.
  • Fixed minor typos in the string literals and the Help Book.
  • Changed the icon in the program's alert panel.


  • OS X 10.10 or later

Similar Software

Suggest other similar software
Create a collection and add  to it.
Like this app? Be the first to add it to a collection! Create a Collection by bringing together complementary apps that have a common theme or purpose, then share it and discover new collections! + Create a Collection

Chac User Discussion

5 6


Current Version (2.x)


Downloads 14,197
Version Downloads 1
License Commercial
Date 17 Mar 2018
Platform Intel 64 / OS X
Price $9.99
To leave a comment, you need to be logged in.
Sort by: Time | Smiles
MacUpdate Promo