A map formed by the projection of a sphere or part of a sphere on a plane, especially an adjustable circular star map that shows the appearance of the heavens at a specific time and place.
- On the third floor of the Paris Observatory Cassini had laid out a planisphere, a map of the World using an azimuthal projection with the North Pole at the centre.
- Also known as a star wheel, a planisphere is the secret decoder of the sky.
- Emerging from the whitewashed labyrinth of the Stone Town I found myself looking straight onto a pair of large nineteenth century buildings, both built immediately against the flat blue planisphere of the sea.
- Example sentences
- By far the most popular type is the planispheric astrolabe, on which the celestial sphere is projected onto the plane of the equator.
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