. English: An Astronomer with Astrolabe and a TelescopeA print after a French 13th century manuscript (now in the Bodelian Library, Oxford). Despite the title given, the man is actually holding a sighting tube rather than a telescope. By the 4th century BC, sighting tubes were known to be of use in observing the stars and planets, since they helped to eliminate extraneous light. An Astronomer . 1854. Rye 309 An Astronomer with Astrolabe and a Telescope RMG PT3458

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