per·i·he·li·on / ˌperəˈhēlyən; -ˈhēlēən/ •
n. (pl. -he·li·a / -ˈhēlyə; -ˈhēlēə/ or -he·li·ons) Astron. the point in the orbit of a planet, asteroid, or comet at which it is closest to the sun.The opposite of aphelion.
The Oxford Pocket Dictionary of Current English
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perihelion
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perihelion The point in the Earth's elliptical orbit at which the planet is closest to the Sun. During the present epoch this occurs about the beginning of January, when the average amount of incident solar radiation is at a maximum. See also APHELION.
A Dictionary of Earth SciencesAILSA ALLABY and MICHAEL ALLABY
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perihelion
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perihelion Point in the orbit of a planet, asteroid, comet or other body (such as a spacecraft) moving around the Sun at which the body is nearest the Sun.
World Encyclopedia
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perihelion
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perihelion XVII. Graecized form of modL. perihēlium, f. Gr. PERI- + héliosSUN.
The Concise Oxford Dictionary of English EtymologyT. F. HOAD
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