astrograph

noun
as·​tro·​graph | \ˈastrōˌgraf\
plural -s

Definition of astrograph 

1 : a photographic telescope designed for use in mapping the heavens

2 : a now little used navigational instrument for projecting star-altitude curves from film directly onto a Mercator chart of proper scale

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History and Etymology for astrograph

International Scientific Vocabulary astr- + -graph

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