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» Wills' astronomical observations

Wills' astronomical observations

A page of Wills' astronomical observations for calculating latitude and longitude.

Astronomical navigation requires the observation of the position of particular objects such as the sun, moon, planets and particular stars, at precisely determined times.  The figures down the right hand side are the degree elevations of 'B(eta) Lauri' (the second star in the constellation Corona Australis), the planet Mercury (although Wills has also written 'Jupiter'), and the star Canopus.  The figures down the left hand side record the time of each observation. The reference to 'Duplex No 5243' records which of his timepieces was being used.

Australian Manuscripts Collection, MS 13071