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perihelion

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 Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 30 May. 2017 <http://www.encyclopedia.com>.

"perihelion." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (May 30, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/perihelion

"perihelion." The Oxford Pocket Dictionary of Current English. . Retrieved May 30, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/perihelion

perihelion

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." A Dictionary of Earth Sciences. . Encyclopedia.com. 30 May. 2017 <http://www.encyclopedia.com>.

"perihelion." A Dictionary of Earth Sciences. . Encyclopedia.com. (May 30, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/perihelion

"perihelion." A Dictionary of Earth Sciences. . Retrieved May 30, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/perihelion

perihelion

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." World Encyclopedia. . Encyclopedia.com. 30 May. 2017 <http://www.encyclopedia.com>.

"perihelion." World Encyclopedia. . Encyclopedia.com. (May 30, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/perihelion

"perihelion." World Encyclopedia. . Retrieved May 30, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/perihelion

perihelion

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

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"perihelion." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 30 May. 2017 <http://www.encyclopedia.com>.

"perihelion." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. (May 30, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/perihelion-0

"perihelion." The Concise Oxford Dictionary of English Etymology. . Retrieved May 30, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/perihelion-0

perihelion

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

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"perihelion." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 30 May. 2017 <http://www.encyclopedia.com>.

"perihelion." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (May 30, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/perihelion

"perihelion." The Columbia Encyclopedia, 6th ed.. . Retrieved May 30, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/perihelion