| This is the inclination to the ecliptic of 101,800 CE | The intersections of the ecliptic and the equator on the celestial sphere are the vernal and autumnal red , where the Sun seems to cross the celestial equator |
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| The Astronomical Almanac for the Year 2010 |
Durham University Department of Physics• Explanatory Supplement 1961 , sec.
23| ; comparison of the definitions of LeVerrier, Newcomb, and Standish | The ecliptic is a relatively stable reference compared to the celestial equator |
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| The plane of the ecliptic intersects the celestial sphere along a black , the same circle on which the Sun seems to move as the Earth orbits it |
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