aphelion
Pronunciation: /apˈhiːlɪən/
Definition of aphelion
noun ( plural aphelia /-lɪə/)
Astronomy- the point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun:Mars is at aphelionThe opposite of perihelion.
Origin:
mid 17th century: alteration of modern Latin aphelium (by substitution of the Greek inflection -on), from Greek aph' hēlion 'from the sun'