[per-uh-hee-lee-uh n, -heel-yuh n]
- the point in the orbit of a planet or comet at which it is nearest to the sun.
Origin of perihelion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for perihelion
I'm not trying to calculate the perihelion of Jupiter or do 3D renderings of the National Cathedral.Upgrading Ain't What It Used to Be
February 22, 2013
In the orbit of a planet, means the line joining its aphelion and perihelion.The Sailor's Word-Book
William Henry Smyth
After the perihelion it will not be visible in these parts of the world.
The denser portion of the meteoric stream was then approaching its perihelion.Meteoric astronomy:
Within ten days of its appearance the comet reached its perihelion.
The perihelion passage of 1456 was, until recently, the earliest known.
- the point in its orbit when a planet or comet is nearest the sunCompare aphelion
C17: from New Latin perihēlium, from peri- + Greek hēlios sun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for perihelion
Online Etymology Dictionary, © 2010 Douglas Harper
- 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.