Giacomo Filippo Maraldi (August 21, 1665 РDecember 1, 1729) was an French-Italian astronomer and mathematician. His name is also given as Jacques Philippe Maraldi. He was the nephew of Giovanni Cassini, and worked most of his life at the Paris Observatory (1687 Р1718). He also is the uncle of Jean-Dominique Maraldi. August 21 is the 233rd day of the year (234th in leap years) in the Gregorian Calendar. ... Events March 4 - Start of the Second Anglo-Dutch War. ... December 1 is the 335th (in leap years the 336th) day of the year in the Gregorian calendar. ... Events July 30 - Baltimore, Maryland is founded. ... An astronomer or astrophysicist is a scientist whose area of research is astronomy or astrophysics. ... A mathematician is a person whose primary area of study and research is mathematics. ... Giovanni Domenico (Jean-Dominique) Cassini Portrait Giovanni Domenico Cassini (June 8, 1625 - September 14, 1712) was an Italian astronomer and engineer. ... gros pd]], enfoire at Nan̤ay. ... Events March 19 - The men under explorer Robert Cavelier de La Salle murder him while searching for the mouth of the Mississippi River. ... // Events July 21 - Treaty of Passarowitz signed November 22 - Off the coast of Virginia, English pirate Edward Teach (best known as Blackbeard) is killed in battle when a British boarding party cornered and then shot and stabbed him more than 25 times. ...

From 1700 until 1718 he worked on a catalog of fixed stars, 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 the corona visible during a solar eclipse belongs to the Sun not to the Moon, and he discovered R Hydrae as a variable star. Events January 1 - Russia accepts Julian calendar. ... // Events July 21 - Treaty of Passarowitz signed November 22 - Off the coast of Virginia, English pirate Edward Teach (best known as Blackbeard) is killed in battle when a British boarding party cornered and then shot and stabbed him more than 25 times. ... A fixed star is a celestial object that does not seem to move (in comparison to the other stars of the night sky). ... Events England, France, Munster and Cologne invade the United Provinces, therefore this name is know as ´het rampjaar´ (the disaster year) in the Netherlands. ... // Events January 23 - The Principality of Liechtenstein is created within the Holy Roman Empire April 25 - Daniel Defoe publishes Robinson Crusoe June 10 - Battle of Glen Shiel Prussia conducts Europes first systematic census Miners in Falun, Sweden find an apparently petrified body of Fet-Mats Israelsson in an unused... Mars is the fourth planet from the Sun in the solar system, named after the Roman god of war (the counterpart of the Greek Ares), on account of its blood red color as viewed in the night sky. ... The corona is the luminous plasma atmosphere of the Sun extending millions of kilometres into space, most easily seen during a total solar eclipse, but also observable in a coronagraph. ... Photo taken during the 1999 eclipse. ... The Sun is the spectral type G2V yellow star at the center of Earths solar system. ... Bulk composition of the moons mantle and crust estimated, weight percent Oxygen 42. ... R Hydrae is a Mira-type variable star in the constellation Hydra. ... Most stars are of almost constant luminosity. ...

He also helped with the survey based on the Paris Meridian. The Paris Meridian is a meridian line running through Paris, now longitude 2°20′14″ east. ...

In mathematics he is most known for obtaining experimentally the angle in the rhombic dodecahedron shape in 1712, which is still called Maraldi angle. Euclid, detail from The School of Athens by Raphael. ... This article is about angles in geometry. ... The rhombic dodecahedron is a convex polyhedron with 12 rhombic faces. ... // Events Treaty of Aargau signed between Catholic and Protestants. ...

Craters on the Moon and Mars were named in his and his nephew's honor. Tycho crater on Earths moon. ...

External links

• History of Mars Observations
• Short biography