- Giacomo F. Maraldi
Giacomo Filippo Maraldi (
August 21 ,1665 –December 1 ,1729 ) was an French-Italianastronomer andmathematician . His name is also given as Jacques Philippe Maraldi.Born inPerinaldo (modernLiguria ) he was the nephew of Giovanni Cassini, and worked most of his life at theParis Observatory (1687 – 1718). He also is the uncle ofJean-Dominique Maraldi .From 1700 until 1718 he worked on a catalog of
fixed star s, and from 1672 until 1719 he studied Mars extensively.His most famous astronomical discovery was that the ice caps on Mars are not exactly on the rotational poles of that body. He also recognized that thecorona visible during asolar eclipse belongs to theSun not to theMoon , and he discoveredR Hydrae as avariable star .He also helped with the survey based on the
Paris Meridian .He is also credited for the first observation (1723) of what is usually referred to as
Poisson's spot , an observation that was unrecognized until its rediscovery in the early 1800s byDominique Arago . At the time of Arago's discovery, Poisson's spot gave convincing evidence for the contested wave nature of light.In
mathematics he is most known for obtaining experimentally theangle in therhombic dodecahedron shape in 1712, which is still calledMaraldi angle .Craters on the Moon and Mars were named in his and his nephew's honor.
External links
* [http://www.uapress.arizona.edu/onlinebks/mars/chap03.htm History of Mars Observations]
* [http://www.seds.org/messier/xtra/Bios/maraldi1.html Short biography]
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