Data Portal @ linkeddatafragments.org

Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Jean_Richer> ?p ?o. }

• Jean_Richer abstract "Jean Richer (1630–1696) was a French astronomer and assistant (élève astronome) at The French Academy of Sciences, under the direction of Giovanni Domenico Cassini.Between 1671 and 1673 he performed experiments and carried out celestial observations in Cayenne, French Guiana, at the request of the French Academy. His observations and measurements of Mars during its perihelic opposition, coupled with those made simultaneously in Paris by Cassini, led to the earliest data-based estimate of the distance between Earth and Mars, which they then used to calculate the distance between the Sun and Earth (the astronomical unit).While there he also measured the length of a seconds pendulum, that is a pendulum with a half-swing of one second, and found it to be 1.25 lignes (2.8 millimeters*) shorter than at Paris. Isaac Newton later commented that if, as he had proposed, the force of gravity decreases with the inverse square of the distance between objects, the obvious conclusion to be drawn from Richer's work is that near-equatorial Cayenne is further from the center of the earth than Paris, where the first such measurements had been taken. Thus the earth could not be spherical, as had earlier been presumed, but rather bulges at and near the equator. It could be said that Richer was the first person to observe a change in gravitational force over the surface of the earth, beginning the science of gravimetry. Richer's 1673 return to Paris was duly celebrated, and when his data were reduced, the findings for which we remember him could be made public. However, publication was delayed, for unknown causes, until 1679, when a work entitled Observations Astronomiques et Physiques Faites en L'Isle de Caïenne par M. Richer, de l'Academie Royale des Sciences. was released under Richer's name. Not long thereafter, he was assigned to an engineering project in Germany. The remainder of his life is undocumented. Most biographers believe that he died at Paris in 1696.note: this does not agree with the difference of 2.5 minutes observed as quoted on the pendulum page... This number gives a time difference of 8.1 minutes (~5.2 if the world's lowest, in Mexico City, is assumed (still a factor of 2x above quoted))↑ ↑".
• Jean_Richer birthDate "1630".
• Jean_Richer birthYear "1630".
• Jean_Richer deathDate "1696".
• Jean_Richer deathYear "1696".
• Jean_Richer viafId "27271490".
• Jean_Richer wikiPageExternalLink richer.html.
• Jean_Richer wikiPageExternalLink Richer.html.
• Jean_Richer wikiPageID "12209510".
• Jean_Richer wikiPageRevisionID "540457919".
• Jean_Richer dateOfBirth "1630".
• Jean_Richer dateOfDeath "1696".
• Jean_Richer hasPhotoCollection Jean_Richer.
• Jean_Richer name "Richer, Jean".
• Jean_Richer placeOfDeath "Paris".
• Jean_Richer shortDescription "French astronomer".
• Jean_Richer description "French astronomer".
• Jean_Richer description "French astronomer".
• Jean_Richer subject Category:1630_births.
• Jean_Richer subject Category:1696_deaths.
• Jean_Richer subject Category:French_astronomers.
• Jean_Richer type Astronomer109818343.
• Jean_Richer type CausalAgent100007347.
• Jean_Richer type FrenchAstronomers.
• Jean_Richer type LivingThing100004258.
• Jean_Richer type Object100002684.
• Jean_Richer type Organism100004475.
• Jean_Richer type Person100007846.
• Jean_Richer type PhysicalEntity100001930.
• Jean_Richer type Physicist110428004.
• Jean_Richer type Scientist110560637.
• Jean_Richer type Whole100003553.
• Jean_Richer type YagoLegalActor.
• Jean_Richer type YagoLegalActorGeo.
• Jean_Richer type Agent.
• Jean_Richer type Person.
• Jean_Richer type Person.
• Jean_Richer type Q215627.
• Jean_Richer type Q5.
• Jean_Richer type Agent.
• Jean_Richer type NaturalPerson.
• Jean_Richer type Thing.
• Jean_Richer type Person.
• Jean_Richer comment "Jean Richer (1630–1696) was a French astronomer and assistant (élève astronome) at The French Academy of Sciences, under the direction of Giovanni Domenico Cassini.Between 1671 and 1673 he performed experiments and carried out celestial observations in Cayenne, French Guiana, at the request of the French Academy.".
• Jean_Richer label "Jean Richer".
• Jean_Richer label "Jean Richer".
• Jean_Richer label "Jean Richer".
• Jean_Richer label "Jean Richer".
• Jean_Richer label "Jean Richer".
• Jean_Richer label "Jean Richer".
• Jean_Richer label "Рише, Жан".
• Jean_Richer label "ジャン・リシェ".
• Jean_Richer sameAs Jean_Richer.
• Jean_Richer sameAs Jean_Richer.
• Jean_Richer sameAs Jean_Richer.
• Jean_Richer sameAs ジャン・リシェ.
• Jean_Richer sameAs Jean_Richer.
• Jean_Richer sameAs Jean_Richer.
• Jean_Richer sameAs m.02vvz4h.
• Jean_Richer sameAs Q720451.
• Jean_Richer sameAs Q720451.
• Jean_Richer sameAs Jean_Richer.
• Jean_Richer wasDerivedFrom Jean_Richer?oldid=540457919.
• Jean_Richer givenName "Jean".
• Jean_Richer isPrimaryTopicOf Jean_Richer.
• Jean_Richer name "Jean Richer".
• Jean_Richer name "Richer, Jean".
• Jean_Richer surname "Richer".