Solar system and comets in relation to other solar systems, about 1780.

"Figure des Tourbillons Celestes ..." anonymous engraver, published in a French book about 1780. Copper engraved chart showing the solar system with two comets at centre, and how their orbits are distorted by the gravitational effects of other stars (and their planets.) Two folds as published, plate mark and good margins. Size 18 x 14.5 cms plus margins. Ref F2776