Celestial Planisphere. This intricate chart shows the southern celestial hemisphere as known in 1690. Its pair, G200:2/6, shows the northern celestial hemisphere. They were produced in 1690 by mathematician Joseph Harris and publisher John Senex. Both include careful description of the construction of the charts and a series of examples and problems for how to use them. The chart of the southern sky includes observations made by Edmond Halley from the island of St Helena in 1676-8 and published in 1686. His work was part of an ongoing project to map the stars accurately that had also led to the founding of the Royal Observatory at Greenwich in 1675.

Engraved and Sold by I Senex at the Globe over against St Dunstans Church in Fleet Street