perioecus
Someone living on the same latitude as someone else, but on a different or opposite side of the world; one's antithesis.
obsolete
How comes it to pass, that in the same site, in one latitude, to such as are periœci, there should be such difference of soil, complexion, colour, metal, air, etc.
Where it comes from
From Late Latin perioeci, from Ancient Greek περίοικοι (períoikoi), plural of περίοικος (períoikos, “neighbour”), from περι- (peri-, “peri-”) + οἶκος (oîkos, “house”).
Adapted from the Wiktionary entry perioecus (CC BY-SA 4.0).