If we where on a Moebius Band that has two sides, only, then we would change from the inside to the outside ever 12.900 years, according to the precession of the equinoxes (complete roation of the rotational axis of the our Home Planet Terra 1, also called a 'Platonic year') ..but..
what,
if, ..
it wasn't just a two-sided infinity loop? What if it had three or more sides (image: https://img.fotocommunity.... and there where other influences, too? Then the whole Maja Calendar would be off...!!