Bland arbeten.
Encyclopédie ou dictionnaire universel raisonné des connaissances humaines.
1664-1740. Född i Trondheim, död i Köpenhamn.
Norsk skeppare, författare och kartograf. Han tillbringade sin ungdom i Nordland i Norge där han drev jordbruk och affärer. Kom till Bergen där han lärde sig navigation. Fick snart rykte om sig som en framstående sjöman med stora kunskaper om norska kusten. Vice ståthållaren Fr. Gabel gav honom i uppdrag att kartlägga den norska kusten. I flera år sysselsatte han sig med detta. Kartverket blev aldrig utgivet. Kartan över Oslofjorden blev emellertid upptagen i van Keulens atlas, och det är också troligt att hans originalteckningar ligger till grund för andra holländska sjökort som kom ut under den tiden. Heitmann var i övrigt en allsidig man. Ett tag var han bosatt i Christiania (Oslo) som 'mathematicus'. Utgav där en andaktsbok och en psalmbok för sjömän. Efter hans död kom en meteorologisk skrift, 'Physiske Betaenkninger over Solens Varme, Luftens Skarpe Kuld og Nord-Lyset' (1741) ut och året därpå: 'Eenfoldige Betaenkninger over den Julianske og Gregorianske Calender'. Han lade här fram ett förslag till en ...
Bland arbeten.
Physiske Betaenkninger over Solens Varme, Luftens Skarpe Kuld og Nord-Lyset.
Eenfoldige Betaenkninger over den Julianske og Gregorianske Calender.
N. biogr. leks.
GIGAS [GIGANTE, GIGUS] JOANNES [IOANNE] MICHAEL.
1580-1650+.
Doctor, mathematician and geographer.
Bland arbeten.
Atlas of Archbishopric of Cologne 1620 (maps used later by Blaeu & Hondius), Paderborn, J. Hondius (pre-1629), Osnabrug, Westphalia, Munster, Hildesheim – all n.d.
Tooley.
Amiral Häggs flaggkarta. - Stockholm 1888.
Album Vilmorin 1871. - Faguet.
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.
