(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).

plural of refracting telescope

plural of reflecting telescope

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.

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

plural of zenith telescope

plural of transit telescope

Synonym of transit instrument

(astronomy) An instrument that detects X-rays originating from outside the Earth's atmosphere.