equinoctial circle

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Definitions from WordNet

Noun equinoctial circle has 1 sense

celestial equator, equinoctial circle, equinoctial line, equinoctial - the great circle on the celestial sphere midway between the celestial poles
--₁ is a kind of great circle
--₁ has particulars: right ascension

Definitions from the Web

Equinoctial Circle

Description:

An equinoctial circle refers to either of the two great circles of the celestial sphere that intersect the celestial equator at the equinoxes. It is an imaginary line that divides the celestial sphere into northern and southern hemispheres. The equinoctial circle is an essential concept in astronomy and navigation.

Sample Sentences:

The equinoctial circle is a significant reference point for determining celestial coordinates.
During the vernal equinox, the sun crosses the equinoctial circle from south to north.
Many ancient monuments were constructed in alignment with the equinoctial circle.

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