| the brightness of a star in comparison with that of the sun: the luminosity of Sirius is expressed as 23 and indicates intrinsic brightness 23 times greater than the sun |
| 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 |
| Virgo (vûr'gō) Pronunciation Key
A constellation in the region of the celestial equator near Leo and libra. Virgo (the Virgin) contains the bright star Spica and is the sixth sign of the zodiac. |
| VIRGO variability of [solar] irradiance and gravity oscillations |