perihelion

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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.

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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.

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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.

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perihelion XVII. Graecized form of modL. perihēlium, f. Gr. PERI- + hélios SUN.

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perihelion (pĕr´əhē´lēən), point nearest the sun in the orbit of a body about the sun. See apsis.