That’s likely an Aztec calendar disc. The real one is, I believe, in Mexico City. It’s quite a work, to be sure.
But it ain’t Mayan.
“But it ain’t Mayan.”
I just looked it up, mine is Mayan. There are twenty different versions of the Mayan calendar as the Mayans studied the moon and other celestial bodies and made calendars of those, too, the paths of the bodies. The one based on the sun is the one I have.