Planisphere, 1750-1775.
3 4 c m
40cm
actual image size: 32cm x 26cm

Planisphere, 1750-1775.

© Science Museum / Science & Society Picture Library

Description

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.
 

Image Ref.

10190497
 

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