*heteroscian*

n. [ Gr. &unr_;; &unr_; other + &unr_; shadow: cf. F. hétéroscien. ] One who lives either north or south of the tropics, as contrasted with one who lives on the other side of them; -- so called because at noon the shadows always fall in opposite directions (the one northward, the other southward). [ 1913 Webster ]