perihelion
Americannoun
-
perihelia
plural
noun
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Nouns
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
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
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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
The perihelion portion of its orbit lies between the orbits of Mars and the earth, and the aphelion part is outside the orbit of Mars.
From Astronomical Curiosities Facts and Fallacies by J. Ellard Gore
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
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
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
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
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 David Peck Todd
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