Why was the Anti-Earth "antiterra" so important in ancestral time?
Cf.
Anti-Earth on the Pythagoreans appeared invisible from the Earth they knew because it occupied an “inner orbit” in the opposite part of the inhabited hemisphere, which always looked to the outside of the entire system. Not all the celestial bodies were known then and with the anti-Earth the perfect and sacred number [tetraktys] was then completed.
Cf.
PYTHAGORAS - What is wrong with my Astronomical Doctrine? Around the central fire revolve the ten Celestial Bodies, the sky of the fixed stars, Jupiter, Saturn, Mercury, Venus, Mars, the Sun, the Moon, the Earth and the Anti-Earth[1].
UMBERTO ECO - Exactly! His Astronomical Doctrine was revolutionary, he anticipated the Copernican one because he did not believe that the Planets revolved around the Earth. But why Anti-Earth, a body no one has ever seen?
PYTHAGORAS - But because this is the only way to reach the “perfect number”[2] of ten!
[1] Anti-Earth on the Pythagoreans appeared invisible from the Earth they knew because it occupied an “inner orbit” in the opposite part of the inhabited hemisphere, which always looked to the outside of the entire system. Not all the celestial bodies were known then and with the anti-Earth the perfect and sacred number [tetraktys] was then completed.
[2] Perfect number …ten! (Cf. tetraktys n, 12 )
Arcelus-Ulibarrena, J.M., The “Number” facing of its terminology in the "Interview of Umberto Eco to Pythagoras" [Mystical Theological School of Pythagoras, Kroton, Magna Graecia, VI century BC]
DOI: 10.13140/RG.2.2.19491.12324/1