<P> The perihelion (/ ˌpɛrɪˈhiːliən /) of any orbit of a celestial body about the Sun is the point where the body comes nearest to the Sun . It is the opposite of aphelion (/ æpˈhiːliən /), which is the point in the orbit where the celestial body is farthest from the Sun . </P> <P> The words perihelion and aphelion were coined by Johannes Kepler to describe the orbital motion of the planets . The words are formed from the prefixes peri - (Greek: περί, near) and apo - (Greek: ἀπό, away from) affixed to the Greek word for the sun, ήλιος . </P>

What does the term perihelion and aphelion mean
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