higher apsis

higher apsis

noun
See under apsis.
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apsis

[ap-sis]
noun, plural apsides [ap-si-deez] .
1.
Astronomy. either of two points in an eccentric orbit, one (higher apsis) farthest from the center of attraction, the other (lower apsis) nearest to the center of attraction.
2.
Architecture. an apse.

Origin:
1595–1605; < Latin < Greek hapsís (felloe of) a wheel, arch, vault, orig., fastening, equivalent to háp(tein) to fasten + -sis -sis

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World English Dictionary
apsis (ˈæpsɪs)
 
n , pl apsides
1.  Also called: apse either of two points lying at the extremities of an eccentric orbit of a planet, satellite, etc, such as the aphelion and perihelion of a planet or the apogee and perigee of the moon. The line of apsides connects two such points and is the principal axis of the orbit
2.  another name for apse
 
[C17: via Latin from Greek; see apse]
 
apsidal
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

apsis
"perigree of the moon, perihelion of a planet" (plural apsides), 1650s, from L. apsis "arch, vault" (see apse).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
apsis  [%PREMIUM_LINK%]     (āp'sĭs)  Pronunciation Key 
Plural apsides (āp'sĭ-dēz')
In the path of an orbiting body, either of the two points at which it is closest to or farthest away from the body it is orbiting. See also apoapsis, periapsis.

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