Planisphere, 1750-1775.

Planisphere, 1750-1775.
3 4 c m
actual image size: 32cm x 26cm


This planisphere was made by Jeremiah Sison. The outer ring carries the calendar, the next ring the time, and the inner disc carries information about certain bright stars. The index had a cursor which was used to align a star with the date and the time of transit, or pasage acros the meridian. The times of the transits of all the other stars marked were then shown.

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© Science Museum / Science & Society Picture Library

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