star diagonalA gadget resembling a plumbing elbow fitting, containing a mirror or prism, attached to a downward-pointing focuser to redirect the beam of light upward for more convenient viewing through a telescope. That is, a star diagonal fits into a focuser, has an eyepiece fitted into it, and bends the light path through a right angle. Related category TELESCOPE EQUIPMENT AND TECHNIQUESAlso on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History |