Waesbergen, Johannes Janssonius van.
fl. 1661-81 (JAN JANSSON'S HEIRS)
Van Waesbergen, established as a bookseller in Amsterdam, acquired by inheritance from his father-in-law Jan Jansson many of Jansson's plates including those of the Atlas Minor, the Civitates Orbis Terrarum and the Atlas of the Antique World. These works were republished by him, or after his death in 1681 by his son, also named Johannes. For a time he was associated with Moses Pitt in the abortive attempt in 1680-81 to publish an English version of the major atlases by Blaeu and Jansson.
1724-1804.
Dansk ämbetsman. Född och död i Köpenhamn. Började 1738 studera och tog en teologisk examen 1743. Efter flera års studieresor i Tyskland och Holland blev han 1754 anställd som matematiker i marinens tjänst. 1760 fick han titeln professor, och 1763 blev han navigationsdirektör. Medlem av olika danska lärda sällskap. Var en produktiv författare inom sitt fackområde, och utarbetade flera sjökort, speciellt över Kattegatt och danska farvatten.
Ehrencron.
Bland arbeten.
Frisia, in Winsemius' Chronicle of Frisia 1622. Använd av Blaeu 1631.
Tooley.
Amiral Häggs flaggkarta. - Stockholm 1888.
Vittåtel, Aira caryophyllea - Lindman, C. A. M, Bilder ur Nordens Flora 1917-26.
Cassini de Thury, César-François
Biografiska uppgifter:17 June 1714 – 4 September 1784
César-François Cassini de Thury (17 June 1714 – 4 September 1784), also called Cassini III or Cassini de Thury, was a French astronomer and cartographer.
Cassini de Thury was born in Thury-sous-Clermont (Oise), the second son of Jacques Cassini and Suzanne Françoise Charpentier de Charmois. He was a grandson of Giovanni Domenico Cassini, and would become the father of Jean-Dominique Cassini, Comte de Cassini.
In 1735, he became a member of the French Academy of Sciences as a supernumerary adjunct astronomer, in 1741 as an adjunct astronomer, and in 1745 as a full member astronomer.
In January, 1751 he was elected a Fellow of the Royal Society.
He succeeded to his father’s official position in 1756 and continued the hereditary surveying operations. In 1744, he began the construction of a great topographical map of France, one of the landmarks in the history of cartography. Completed by his son Jean-Dominique, Cassini IV and published by the Académie des Sciences from 1744 to 1793, its 180 plates are known as the Cassini map(fr).
The post of director of the Paris observatory was created for his benefit in 1771 when the establishment ceased to be a dependency of the French Academy of Sciences.
His chief works are: La méridienne de l’Observatoire Royal de Paris (1744), a correction of the Paris meridian; Description géométrique de la terre (1775); and Description géométrique de la France (1784), which was completed by his son ('Cassini IV').
César-François Cassini de Thury died of smallpox in Paris on 4 September 1784,
The Cassini projection is a map projection described by César-François Cassini de Thury in 1745. It is the transverse aspect of theequirectangular projection, in that the globe is first rotated so the central meridian becomes the 'equator', and then the normal equirectangular projection is applied.
In practice, the projection has always been applied to models of the earth as an ellipsoid, which greatly complicates the mathematical development but is suitable for surveying. Nevertheless the use of the Cassini projection has largely been superseded by the Transverse Mercator projection, at least with central mapping agencies.
Areas along the central meridian, and at right angles to it, are not distorted. Elsewhere, the distortion is largely in a north-south direction, and varies by the square of the distance from the central meridian. As such, the greater the longitudinal extent of the area, the worse the distortion becomes.
Due to this, the Cassini projection works best on long, narrow areas, and worst on wide areas.
