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A star chart that's used to display what stars are visible at a specific time and date from certain latitude. It consists of two circular layers. The bottom layer contains a print out of the stars and constellations and the top layer has a transparent section. By rotating the top layer to the required date and time the stars that are currently visible are shown through the top window.

Popular examples cover latitudes 52.5N, 40N and 35S.

A planisphere for latitude 51.5N

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