noun, plural a·phe·li·a [uh-fee-lee-uh, uh-feel-yuh, ap-hee-lee-uh] /əˈfi li ə, əˈfil yə, æpˈhi li ə/.
Origin of aphelion
Examples from the Web for aphelion
The motion of Newton's comet at aphelion may be equally slight.The Education of Henry Adams|Henry Adams
When the earth leaves the aphelion, a reaction takes place, being most rapid in September.Outlines of a Mechanical Theory of Storms|T. Bassnett
An irregularity in the motion of a planet by which it deviates from the aphelion or apogee.The Sailor's Word-Book|William Henry Smyth
It has its perihelion near the orbit of the earth, and its aphelion a little beyond that of Jupiter.Letters on Astronomy|Denison Olmsted
Whereas at its greatest distance from the sun (aphelion) the velocity is reduced to about 10 feet a second!Astronomical Curiosities|J. Ellard Gore
British Dictionary definitions for aphelion
noun plural -lia (-lɪə)
Word Origin for aphelion
Word Origin and History for aphelion
"point farthest from the sun" (of a celestial body's orbit), 1670s, a Grecianized form of Modern Latin aphelium, altered by Johannes Kepler based on Greek apo heliou "away from the sun," from apo "away from" (see apo-) + heliou, genitive of helios "sun" (see sol). The whole was formed on the model of Ptolemaic apogaeum (see apogee) to reflect the new helio-centric model of the universe.