perihelion
Americannoun
noun
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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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Dr Balaji said opportunities to spot the comet may occur "in the days around perihelion, depending on local conditions and the comet's behaviour".
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
Even as the Northern Hemisphere experiences winter’s chill, our planet on Tuesday, depending on your time zone, will be at perihelion, the closest it gets to the sun during its elliptical orbit.
From New York Times ● Jan. 1, 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
From the immense rapidity of its motion as it approaches its perihelion, it is probable that it is a comet of very long period.
From Antigua and the Antiguans, Volume II (of 2) A full account of the colony and its inhabitants from the time of the Caribs to the present day by Anonymous
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 Humboldt, Alexander von
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 Forbes, George
The extremes of temperature at perihelia and aphelia to which comets are subjected did not bother him particularly.
From Astronomy: The Science of the Heavenly Bodies by Todd, David Peck
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
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.
