This fascinating sheet focuses on the theories of comets according to the recent astronomical observations of Sir Isaac Newton and William Whiston, Newton's successor as Lucasian professor at Cambridge. The corners of the sheet depict the hypotheses of Kepler, Hevelius, Pierre Petit, and Cassini., with their theories described in a cartouche at bottom. Several small diagrams depict various cometary phenomena observed. A large cartouche at top explains comets in general.

Johann Gabriel Doppelmayr was a professor of mathematics at the Aegidien Gymnasium in Nuremberg. Doppelmayr and Johann Baptist Homann were frequent collaborators in producing celestial and astronomical charts for atlases. This chart was engraved between 1735 and 1742 and appeared in the two major compilations of Dopplemayr’s works published by Homann Heirs; Atlas Coelestis in quo Mundus Spectabilis... in 1742, and the revised edition Atlas Novus Coelestis... in 1748. Read more about Doppelmayr's life and accomplishments here.

References: Kanas #7.8.3.

Condition: B+

Original color that has been partially refreshed on watermarked paper with light toning along centerfold, minor soiling, light color offsetting, and a professionally repaired centerfold separation at bottom.