A specialized telescope and camera system designed to photograph stars and celestial objects for astronomical study and mapping.
From astro- (star) plus -graph (recording instrument, from Greek graphein, to write/record). Astrographs became standard observatory tools in the late 19th century for creating star catalogs.
Astrographs revolutionized astronomy by replacing human eyes with photographic plates—suddenly scientists could record what they saw and measure it precisely, which led to discovering variable stars and other celestial secrets.
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