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Mayanmajix:

What Is Your Mayan Sign?

There are 260 days in the Mayan Tzolkin Calendar.
There are 20 Mayan Sun Signs and 13 Galactic Tones.
13 x 20 = 260 Days on the Tzolkin Calendar and then it repeats.

Once you enter your date of birth in the calculator below, push the calculate button.
The calculator will show the Tzolkin date which is a combination of a Sun Sign
(also called Day Sign or Day Lord) and a Galactic tone (number 1 - 13).
There are 260 unique combinations or personality patterns.

Question of Birth Time?
Current research is indicating that the Maya began their day at Sun Rise not Midnight. If you happen to be
born in the early AM i.e., 3:00 am you might consider using the previous day to look up your Sun sign and tone.

http://www.mayanmajix.com/TZOLKIN/DT/DT.html