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| any of various groups of stars to which definite names have been given and the section of the heavens occupied by such a group, such as Ursa Major, Andromeda |
| a system of two stars that revolve about a common center of mass |
| summer solstice | |
| —n | |
| 1. | the time at which the sun is at its northernmost point in the sky (southernmost point in the S hemisphere), appearing at noon at its highest altitude above the horizon. It occurs about June 21 (December 22 in the S hemisphere) |
| 2. | astronomy the point on the celestial sphere, opposite the winter solstice, at which the ecliptic is furthest north from the celestial equator. Right ascension: 6 hours; declination: 23.5° |
| summer solstice (sŭm'ər) Pronunciation Key
See under solstice. |