Astronomy: General

The Oxford Pocket Dictionary... A Dictionary of Earth Sciences World Encyclopedia A Dictionary of Astronomy Further reading

perihelion

The Oxford Pocket Dictionary of Current English | 2009 | Copyright

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.

Cite this article
Pick a style below, and copy the text for your bibliography.

MLA
Chicago
APA

"perihelion." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

"perihelion." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O999-perihelion.html

"perihelion." The Oxford Pocket Dictionary of Current English. 2009. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O999-perihelion.html

Learn more about citation styles

perihelion

A Dictionary of Earth Sciences | 1999 | | Copyright

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.

Cite this article
Pick a style below, and copy the text for your bibliography.

MLA
Chicago
APA

AILSA ALLABY and MICHAEL ALLABY. "perihelion." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "perihelion." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O13-perihelion.html

AILSA ALLABY and MICHAEL ALLABY. "perihelion." A Dictionary of Earth Sciences. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-perihelion.html

Learn more about citation styles

perihelion

World Encyclopedia | 2005 | Copyright

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.

Cite this article
Pick a style below, and copy the text for your bibliography.

MLA
Chicago
APA

"perihelion." World Encyclopedia. 2005. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

"perihelion." World Encyclopedia. 2005. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O142-perihelion.html

"perihelion." World Encyclopedia. 2005. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O142-perihelion.html

Learn more about citation styles

perihelion

A Dictionary of Astronomy | 1997 | Copyright

perihelion The point in an elliptical orbit around the Sun that is nearest the Sun's centre.

Cite this article
Pick a style below, and copy the text for your bibliography.

MLA
Chicago
APA

"perihelion." A Dictionary of Astronomy. 1997. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

"perihelion." A Dictionary of Astronomy. 1997. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O80-perihelion.html

"perihelion." A Dictionary of Astronomy. 1997. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-perihelion.html

Learn more about citation styles

perihelion

The Concise Oxford Dictionary of English Etymology | 1996 | | Copyright

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

Cite this article
Pick a style below, and copy the text for your bibliography.

MLA
Chicago
APA

T. F. HOAD. "perihelion." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

T. F. HOAD. "perihelion." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O27-perihelion.html

T. F. HOAD. "perihelion." The Concise Oxford Dictionary of English Etymology. 1996. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O27-perihelion.html

Learn more about citation styles

perihelion

The Columbia Encyclopedia, 6th ed. | 2011 | Copyright

perihelion , point nearest the sun in the orbit of a body about the sun. See apsis .

Cite this article
Pick a style below, and copy the text for your bibliography.

MLA
Chicago
APA

"perihelion." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

"perihelion." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1E1-periheli.html

"perihelion." The Columbia Encyclopedia, 6th ed.. 2011. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-periheli.html

Learn more about citation styles

Free newspaper and magazine articles

	New components of the mercury's perihelion precession.(Report) Magazine article from: Natural Science; 4/1/2011
	Perihelion.(Children's review)(Book review) Magazine article from: Chicago Review; 3/22/2007
	Central forces and secular perihelion motion.(Technical report) Magazine article from: Canadian Journal of Physics; 10/1/2007