1) Optical device 
An astrograph (astrographic camera) is a telescope designed for the sole purpose of astrophotography. Astrographs are usually used in wide field surveys of the night sky as well as detection of objects such as asteroids, meteors, and comets. ==Design== Most research telescopes in this class are refractors, although there are many (usually larger) ...
(from the article `telescope`) Another type of refracting telescope is the astrograph, which usually has an objective diameter of approximately 20 centimetres. The astrograph has a ...
A telescope designed specifically for astrophotography.
a navigational device for projecting altitude curves of the stars and planets onto charts or plotting sheets.