The planisphere: a brief historical review

Astronomy and Astrophysics – Astronomy

Scientific paper

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Historical: Planisphere, Astrolabe

Scientific paper

Planispheres usually consist of two circular discs of cardboard or plastic. The lower one shows a circular map of the sky and is free to spin about a small bolt placed through either the north or the south celestial pole. The upper disc contains an oval-shaped window that allows that portion of the heavens visible from a specific spot on Earth, at a specific time, to be segregated from the map. This paper investigates their design and origins and traces their development through recent astronomical history.

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