perihelion
Americannoun
-
perihelia
plural
noun
Other Word Forms
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Etymology
Origin of perihelion
1660–70; < Greek peri- peri- + hḗli ( os ) sun + -on neuter noun suffix, on the model of perigee; earlier in the New Latin form perihelium
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Example Sentences
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On Monday, the comet was at perihelion, the point at which it is closest to the Sun, which influences how bright it appears.
From BBC ● Jan. 13, 2025
PSP uses a series of Venus flyby's to gradually reduce its perihelion from 36 solar radii in 2018 to 9.5 in 2025.
From Science Daily ● Mar. 27, 2024
The most surprising thing about this cycle, though, is probably when its extremes occur on the calendar: perihelion is in January every year, while aphelion is in July.
From Scientific American ● Jun. 30, 2023
Even as the Northern Hemisphere experiences winter’s chill, our planet on Wednesday will be at perihelion, the closest it gets to the sun during its elliptical orbit.
From New York Times ● Jan. 1, 2023
Without some geographical change the Antarctic ice could not materially diminish during its winter in perihelion, nor increase to any important extent during the opposite phase.
From Island Life Or the Phenomena and Causes of Insular Faunas and Floras by Alfred Russel Wallace
The art has also been applied to the observation of comets at distances from their perihelia so great as to prevent their visual observation.
From History of Astronomy by George Forbes
Those—and they are many—who vaguely think that science is something different from common-sense, and that any book is scientific which talks about perihelia and asymptotes and cetacea, will find their vague notions here well corroborated.
From The Unseen World and Other Essays by John Fiske
In recent years a few have been discovered which are at times considerably within the orbit of Mars, the nearest perihelia being less than 15 million miles beyond the earth's orbit.
From The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli by Various
Moreover, a large majority of comets would then have their aphelia in the direction of the sun’s motion, and therefore their perihelia in the opposite direction.
From Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" by Various
This comet, therefore, which, according to Goldschmidt, passes beyond the orbit of Jupiter, is one of the few whose perihelia are beyond Mars.
From COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 by Alexander von Humboldt
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
