Does anyone know about Pythagoris' 12th planet

Interesting - I'dnever heard of that before. Do you have a citation from which to quote?

Re: Does anyone know about Pythagoris' 12th planet
Algis

The planet "missing" is the Anti-Terra - or Anti-Earth.
This because Pythagoras only knew 9 "planets" - including the Moon and the Sun - and to him the number 10 was the ultimate perfection, the "tetraktys" (10= 1+ 2 + 3 + 4). So he had to "create" a new planet. Aristotle himself never understood what Pythagoras meant by that "Anti-Earth".

From what I was recently told by a scolar he had figured out the 12 planets and the antiearth was included. I was double checking this with a guy who studies various aspects of the bible mythology and he to said there seems to be another earth that is quite the opposite of ours where messages from that place can make their way here and hense Deja Vu!