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About: André-Louis Danjon     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:WikicatFrenchPeople, within Data Space : dbpedia.org associated with source document(s)

Type: Thingfoaf:Personpersondul:NaturalPersonEukaryoteHomo sapiensHumanAnimalanimaleukaryotescientistspeciesschema:Personyago:WikicatPeopleFromCaenyago:WikicatPeopleFromNormandyScientistyago:Astronomer109818343yago:CausalAgent100007347yago:LivingThing100004258yago:Object100002684yago:Organism100004475yago:Person100007846yago:PhysicalEntity100001930yago:Physicist110428004yago:YagoLegalActoryago:YagoLegalActorGeoyago:Scientist110560637yago:Whole100003553yago:Wikicat20th-centuryAstronomersyago:WikicatFrenchAstronomersyago:WikicatFrenchPeople New Facet based on Instances of this Class

André-Louis Danjon (French: [ɑ̃dʁelwi dɑ̃ʒɔ̃]; 6 April 1890 – 21 April 1967) was a French astronomer born in Caen to Louis Dominique Danjon and Marie Justine Binet. Danjon devised a method to measure "earthshine" on the Moon using a telescope in which a prism split the Moon's image into two identical side-by-side images. By adjusting a diaphragm to dim one of the images until the sunlit portion had the same apparent brightness as the earthlit portion on the unadjusted image, he could quantify the diaphragm adjustment, and thus had a real measurement for the brightness of earthshine. He recorded the measurements using his method (now known as the Danjon scale, on which zero equates to a barely visible Moon) from 1925 until the 1950s.