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| the magnitude of a star as it would appear to a hypothetical observer at a distance of 10 parsecs or 32.6 light-years |
| used to designate the brightest star in a constellation |
| celestial equator | |
| —n | |
| equinoctial, Also called: equinoctial circle the great circle lying on the celestial sphere the plane of which is perpendicular to the line joining the north and south celestial poles | |
| celestial equator
A great circle separating the northern and southern hemispheres of the celestial sphere and lying in the same plane as the Earth's equator. The celestial equator is a projection of the Earth's equator outward onto the celestial sphere and is used as the reference point in determining a celestial body's declination. |