perihelium
Per`i*hel"ion, Per`i*he"li*um, n.; pl. Perihelia. Etym: [NL., fr. Gr. (Astron.) Defn: That point of the orbit of a planet or comet which is nearest to the sun; -- opposed to Ant: aphelion.
Per`i*hel"ion, Per`i*he"li*um, n.; pl. Perihelia. Etym: [NL., fr. Gr. (Astron.) Defn: That point of the orbit of a planet or comet which is nearest to the sun; -- opposed to Ant: aphelion.