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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 |
| marking the time when the sun is at the north most point from the celestial equator occurring around June 21 |
| speckle interferometry | |
| —n | |
| astronomy a technique to increase the angular resolution of telescopes that are impaired by atmospheric turbulence, in which the information from a number of exposures of very short duration is combined | |