Cassegrainian telescope Newtonian telescope OAO OSO abbreviate abridge abstract astronomical observatory astronomical telescope binoculars bob boil down capsulize clip coelostat compress concertina condense contract coronagraph coronograph crop crush curtail cut cut back cut down cut off short cut short digest dock elide epitomize field glass foreshorten glass heliostat mow nip observatory opera glasses orrery planetarium poll pollard precis prune radar telescope radio observatory radio telescope reap recap recapitulate reduce reflector refractor retrench scope shave shear shorten snub spectrograph spectroheliograph spectrohelioscope spectroscope spy glass spyglass squash stunt sum up summarize synopsize take in terrestrial telescope trim truncate zenith tube zoom binoculars