counter-earth

counterearth

[koun-ter-urth]
noun
(in Pythagorean astronomy) a planet, out of sight from our part of the earth, whose shadow upon the sun and moon, cast by a central fire that is also out of sight, causes the eclipses.
Also called antichthon.


Origin:
1855–60; counter- + earth, as translation of Greek antíchthōn

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