Edmundus Halleius.Astronomus Regius Geometrię Professor Savilianus.
Printed for Bowles & Carver, No 69 St Paul's Church Yard London. [n.d., but watermarked 1817.]
Mezzotint with very large margins. 350 x 250mm (13¾ x 9¾").
Edmund Halley (1656-1742), astronomer, the first to calculate a comet's orbit. At the University of Oxford his studies of the theories of Sir Isaac Newton inspired him to write his own 'Principles', which he published with his own money in 1687. In 1721 he was made Astronomer Royal and began an 18 year study of the moon's complete revolution through its ascending and descending nodes. He also wrote another important treatise called Astronomiae Cometicae Synopsis (Synopsis on Cometary Astronomy), which he started in 1682 and published in 1705. In this he mathematically demonstrated that comets move in a elliptic orbits around the sun and how over time they would pass the same point. His accurate prediction of the return of what is now Halley's Comet in 1758 validated his theory.
CS:173, this late state not listed. Ex: Collection of The Hon. C. Lennox-Boyd. Wellcome Library no. 3948i.
[Ref: 34139] £220.00