UNDERSTANDING THE HEAVENS: PROPERTY OF A PRIVATE COLLECTION
WITH: Autograph manuscript notebook in Dutch, 6 pp (70 x 91 mm), in original 18th century marbled wrappers, titled "Corte verklaring van het Planetarium me de Stelling van Mr. Cassini. Uynekenaar van de Coninklijte Societijt te London van de accademie te Berlyn..." Recording the planetary observations made by Cassini in 1749, with details on the dates on which each sign of the zodiac was observed, as well as the movements of the planets, and details on their orbits.
Planetarium and book housed together in round turned wood box.
Gian Domenico Cassini (1625-1712) was the first in a line of great astronomers who settled in France. Amongst his many discoveries, were the 2nd, 3rd, 4th, and 5th satellites of Saturn (Tethys, Dione, Rhea, and Iapetus) between the years 1671-1684 (after Huygens' discovery of the 1st, Titan, in 1655), as well as the division of the rings of Saturn in 1675, now known as Cassini's Division. These observations are reflected in the present planetarium. His Grandson, César-François (Cassini III) was a member of the French Académie des Sciences and a foreign member of the Berlin Academy. His astronomical work consisted primarily of observations of lunar and solar eclipses, occultations of stars and planets, and the like, some of which are recorded in the accompanying manuscript.
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