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equinoctial line

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Noun1.equinoctial line - the great circle on the celestial sphere midway between the celestial poles
great circle - a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center


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? Mentioned in ? References in classic literature
 
But we must have already emerged and gone seven hundred or eight hundred leagues; and if I had here an astrolabe to take the altitude of the pole, I could tell thee how many we have travelled, though either I know little, or we have already crossed or shall shortly cross the equinoctial line which parts the two opposite poles midway.
The island of Serendib being situated on the equinoctial line, the days and nights there are of equal length.
 
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