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noun, plural per·i·he·li·a 
[-hee-lee-uh, -heel-yuh] . Astronomy.
[-hee-lee-uh, -heel-yuh] . Astronomy. the point in the orbit of a planet or comet at which it is nearest to the sun.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Perihelion
is always a great word to know.
So is crescent. Does it mean:
| a cloud of interstellar gas and dust that appears hazy, or fuzzy, and extended in a telescope view |
| the figure of the moon in its first or last quarter, resembling a segment of a ring tapering to points at the ends |
Collins
World English Dictionary
| perihelion (ˌpɛrɪˈhiːlɪən) | |
| —n , pl -lia | |
| Compare aphelion the point in its orbit when a planet or comet is nearest the sun | |
| [C17: from New Latin perihēlium, from | |
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History
perihelion
"point at which a celestial body is nearest the Sun," 1690, coined in Mod.L. (perihelium) by Kepler (1596) from Gk. peri "near" + helios "sun" (see sol), and subsequently re-Grecianized.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
perihelion (pěr'ə-hē'lē-ən) Pronunciation Key
(click for larger image in new window) The point at which an orbiting object, such as a planet or a comet, is closest to the Sun. Compare aphelion, perigee. |
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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