plural of X-ray telescope

(astronomy) a type of refracting telescope (refractor) similar to the one used by Galileo Galilei

(astronomy) An alt-azimuth mounted Newtonian reflector (Newtonian telescope); a type of reflecting telescope (reflector).

(astronomy) a star that is fainter than 7th magnitude in apparent magnitude, and therefore in most cases is not visible to the naked eye.

A telescope which, unlike most telescopes used for astronomical purposes, contains an arrangement of lenses presenting an erect (non-inverted) image to the observer, suitable for observation of objects on the Earth's surface.

A device used e.g. on a rifle in aiming a projectile, through which the person aiming looks at the intended target.

(astronomy) A telescope that can point vertically at the zenith

plural of telescopic sight

Synonym of transit instrument

(astronomy) A telescope, having a wide field of view, comprising a thin aspheric lens and a large concave mirror