Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Jean_Picard> ?p ?o }
- Jean_Picard abstract "Jean-Félix Picard (21 July 1620 – 12 July 1682) was a French astronomer and priest born in La Flèche, where he studied at the Jesuit Collège Royal Henry-Le-Grand. He died in Paris, France. He was the first person to measure the size of the Earth to a reasonable degree of accuracy in a survey conducted in 1669–70, for which he is honored with a pyramid at Juvisy-sur-Orge. Guided by Maurolycus's methodology and Snellius's mathematics for doing so, Picard achieved this by measuring one degree of latitude along the Paris Meridian using triangulation along thirteen triangles stretching from Paris to the clocktower of Sourdon, near Amiens. His measurements produced a result of 110.46 km for one degree of latitude, which gives a corresponding terrestrial radius of 6328.9 km. The polar radius has now been measured at just over 6357 km. This was an error only 0.44% less than the modern value. This was another example of advances in astronomy and its tools making possible advances in cartography. Picard was the first to attach a telescope with crosswires (developed by William Gascoigne) to a quadrant, and one of the first to use a micrometer screw on his instruments. The quadrant he used to determine the size of the Earth had a radius of 38 inches and was graduated to quarter-minutes. The sextant he used to find the meridian had a radius of six feet, and was equipped with a micrometer to enable minute adjustments. These equipment improvements made the margin of error only ten seconds, as opposed to Tycho Brahe's four minutes of error. This made his measurements 24 times as accurate. Isaac Newton was to use this value in his theory of universal gravitation.Picard also travelled to Tycho Brahe's Danish observatory, Uraniborg, in order to assess its position accurately so that Tycho's readings could be compared to others.Picard collaborated and corresponded with many scientists, including Isaac Newton, Christiaan Huygens, Ole Rømer, Rasmus Bartholin, Johann Hudde, and even his main competitor, Giovanni Cassini, although Cassini was often less than willing to return the gesture. These correspondences led to Picard's contributions to areas of science outside the field of geodesy, such as the aberration of light he observed while in Uraniborg, or his discovery of mercurial phosphorescence upon his observance of the faint glowing of a barometer. This discovery led to Newton's studies of light's visible spectrum.Picard also developed what became the standard method for measuring the right ascension of a celestial object. In this method, the observer records the time at which the object crosses the observer's meridian. Picard made his observations using the precision pendulum clock that Dutch physicist Christiaan Huygens had recently developed.His book \"Mesure de la Terre\" was published in 1671 and he is regarded to have been a potential inspiration for the fictitious Star Trek character with a similar name.There is a lunar crater named after Picard, on the southwest quadrant of Mare Crisium.The PICARD mission, an orbiting solar observatory, is named after Picard.".
- Jean_Picard wikiPageID "705035".
- Jean_Picard wikiPageLength "8425".
- Jean_Picard wikiPageOutDegree "60".
- Jean_Picard wikiPageRevisionID "703365638".
- Jean_Picard wikiPageWikiLink Aberration_of_light.
- Jean_Picard wikiPageWikiLink Amiens.
- Jean_Picard wikiPageWikiLink Astronomer.
- Jean_Picard wikiPageWikiLink Astronomy.
- Jean_Picard wikiPageWikiLink Barometer.
- Jean_Picard wikiPageWikiLink Cartography.
- Jean_Picard wikiPageWikiLink Category:1620_births.
- Jean_Picard wikiPageWikiLink Category:1682_deaths.
- Jean_Picard wikiPageWikiLink Category:French_astronomers.
- Jean_Picard wikiPageWikiLink Category:French_geodesists.
- Jean_Picard wikiPageWikiLink Category:People_from_La_Flèche.
- Jean_Picard wikiPageWikiLink Category:Roman_Catholic_cleric-scientists.
- Jean_Picard wikiPageWikiLink Christiaan_Huygens.
- Jean_Picard wikiPageWikiLink Earth.
- Jean_Picard wikiPageWikiLink Earth_radius.
- Jean_Picard wikiPageWikiLink France.
- Jean_Picard wikiPageWikiLink Francesco_Maurolico.
- Jean_Picard wikiPageWikiLink Giovanni_Domenico_Cassini.
- Jean_Picard wikiPageWikiLink Isaac_Newton.
- Jean_Picard wikiPageWikiLink Jean-Luc_Picard.
- Jean_Picard wikiPageWikiLink Johannes_Hudde.
- Jean_Picard wikiPageWikiLink Juvisy-sur-Orge.
- Jean_Picard wikiPageWikiLink La_Flèche.
- Jean_Picard wikiPageWikiLink Latitude.
- Jean_Picard wikiPageWikiLink List_of_Roman_Catholic_cleric-scientists.
- Jean_Picard wikiPageWikiLink Mare_Crisium.
- Jean_Picard wikiPageWikiLink Margin_of_error.
- Jean_Picard wikiPageWikiLink Meridian_(astronomy).
- Jean_Picard wikiPageWikiLink Meridian_arc.
- Jean_Picard wikiPageWikiLink Micrometer.
- Jean_Picard wikiPageWikiLink Newtons_law_of_universal_gravitation.
- Jean_Picard wikiPageWikiLink Ole_Rømer.
- Jean_Picard wikiPageWikiLink Paris.
- Jean_Picard wikiPageWikiLink Paris_meridian.
- Jean_Picard wikiPageWikiLink Pendulum_clock.
- Jean_Picard wikiPageWikiLink Phosphorescence.
- Jean_Picard wikiPageWikiLink Picard_(crater).
- Jean_Picard wikiPageWikiLink Picard_(satellite).
- Jean_Picard wikiPageWikiLink Prytanée_National_Militaire.
- Jean_Picard wikiPageWikiLink Pyramid.
- Jean_Picard wikiPageWikiLink Quadrant_(instrument).
- Jean_Picard wikiPageWikiLink Radius.
- Jean_Picard wikiPageWikiLink Rasmus_Bartholin.
- Jean_Picard wikiPageWikiLink Right_ascension.
- Jean_Picard wikiPageWikiLink Sextant.
- Jean_Picard wikiPageWikiLink Society_of_Jesus.
- Jean_Picard wikiPageWikiLink Sourdon.
- Jean_Picard wikiPageWikiLink Telescope.
- Jean_Picard wikiPageWikiLink Triangulation.
- Jean_Picard wikiPageWikiLink Tycho_Brahe.
- Jean_Picard wikiPageWikiLink Uraniborg.
- Jean_Picard wikiPageWikiLink Visible_spectrum.
- Jean_Picard wikiPageWikiLink Willebrord_Snellius.
- Jean_Picard wikiPageWikiLink William_Gascoigne_(scientist).
- Jean_Picard wikiPageWikiLinkText "Jean Picard".
- Jean_Picard wikiPageWikiLinkText "Jean-Felix Picard".
- Jean_Picard wikiPageWikiLinkText "Jean-Félix Picard".
- Jean_Picard wikiPageWikiLinkText "Picard".
- Jean_Picard wikiPageWikiLinkText "Picard, Jean".
- Jean_Picard wikiPageUsesTemplate Template:About.
- Jean_Picard wikiPageUsesTemplate Template:Authority_control.
- Jean_Picard wikiPageUsesTemplate Template:CathEncy.
- Jean_Picard wikiPageUsesTemplate Template:MacTutor_Biography.
- Jean_Picard wikiPageUsesTemplate Template:Reflist.
- Jean_Picard subject Category:1620_births.
- Jean_Picard subject Category:1682_deaths.
- Jean_Picard subject Category:French_astronomers.
- Jean_Picard subject Category:French_geodesists.
- Jean_Picard subject Category:People_from_La_Flèche.
- Jean_Picard subject Category:Roman_Catholic_cleric-scientists.
- Jean_Picard hypernym Astronomer.
- Jean_Picard type Person.
- Jean_Picard type Scientist.
- Jean_Picard type Geodesist.
- Jean_Picard type Scientist.
- Jean_Picard type Thing.
- Jean_Picard comment "Jean-Félix Picard (21 July 1620 – 12 July 1682) was a French astronomer and priest born in La Flèche, where he studied at the Jesuit Collège Royal Henry-Le-Grand. He died in Paris, France. He was the first person to measure the size of the Earth to a reasonable degree of accuracy in a survey conducted in 1669–70, for which he is honored with a pyramid at Juvisy-sur-Orge.".
- Jean_Picard label "Jean Picard".
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