Andrew Ellicott Douglass (5 juillet 1867 à Windsor, Vermont ; † 20 mars 1962 à Tucson, Arizona) était un astronome américain qui développa la science appelée dendrochronologie en se posant la question de l'influence solaire sur les arbres.Portail de l’astronomie Portail de l’astronomie Portail de l’archéologie Portail de l’archéologie Portail des États-Unis Portail des États-Unis

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  • Andrew Ellicott Douglass (5 juillet 1867 à Windsor, Vermont ; † 20 mars 1962 à Tucson, Arizona) était un astronome américain qui développa la science appelée dendrochronologie en se posant la question de l'influence solaire sur les arbres.Portail de l’astronomie Portail de l’astronomie Portail de l’archéologie Portail de l’archéologie Portail des États-Unis Portail des États-Unis
  • Andrew Ellicott Douglass (* 5. Juli 1867 in Windsor, Vermont; † 20. März 1962 in Tucson, Arizona) war ein US-amerikanischer Astronom und gilt als der Begründer der Dendrochronologie.
  • A. E. (Andrew Ellicott) Douglass (July 5, 1867, Windsor, Vermont – March 20, 1962, Tucson, Arizona) was an American astronomer. He discovered a correlation between tree rings and the sunspot cycle."Douglass tracked this into past centuries by studying beams from old buildings as well as Sequoias and other long-lived trees. Noting that tree rings were thinner in dry years, he reported effects on climate of solar variations, particularly in connection with the 17th-century dearth of sunspots that Herschel and others had noticed. Other scientists, however, found good reason to doubt that tree rings could reveal anything beyond random regional variations. The value of tree rings for climate study was not solidly established until the 1960s." [1]Douglass founded the discipline of dendrochronology, which is a method of dating wood by analyzing the growth ring pattern. He started his discoveries in this field in 1894 when he was working at the Lowell Observatory. During this time he was an assistant to Percival Lowell and William Henry Pickering, but fell out with them, when his experiments made him doubt the existence of artificial "canals" on Mars and visible cusps on Venus.Craters on the Moon and Mars are named in his honor.
  • Andrew Ellicot Douglass (Contea di Windsor, 5 luglio 1867 – Tucson, 20 marzo 1962) è stato un astronomo statunitense.Egli fu il fondatore del Laboratorio di ricerca di anelli. Ed è stato anche il fondatore della dendrocronologia, che è un metodo di datazione degli alberi guardando il modello di crescita degli anelli del tronco. Egli ha iniziato le sue prime scoperte di dendrocronologia nel 1894, mentre studiava all'Osservatorio Lowell.
  • Andrew Ellicott Douglass o A. E. Douglass (* 5 de julio de 1867, Windsor, Vermont – 20 de marzo de 1962, Tucson, Arizona), fue un astrónomo estadounidense y fundador del Laboratory of Tree-Ring Research (Laboratorio de Investigación de los Anillos de Árboles) en la Universidad de Arizona. Desarrollo las técnicas de fechados dendrocronológicos.
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  • Andrew Ellicott Douglass (5 juillet 1867 à Windsor, Vermont ; † 20 mars 1962 à Tucson, Arizona) était un astronome américain qui développa la science appelée dendrochronologie en se posant la question de l'influence solaire sur les arbres.Portail de l’astronomie Portail de l’astronomie Portail de l’archéologie Portail de l’archéologie Portail des États-Unis Portail des États-Unis
  • Andrew Ellicott Douglass (* 5. Juli 1867 in Windsor, Vermont; † 20. März 1962 in Tucson, Arizona) war ein US-amerikanischer Astronom und gilt als der Begründer der Dendrochronologie.
  • Andrew Ellicot Douglass (Contea di Windsor, 5 luglio 1867 – Tucson, 20 marzo 1962) è stato un astronomo statunitense.Egli fu il fondatore del Laboratorio di ricerca di anelli. Ed è stato anche il fondatore della dendrocronologia, che è un metodo di datazione degli alberi guardando il modello di crescita degli anelli del tronco. Egli ha iniziato le sue prime scoperte di dendrocronologia nel 1894, mentre studiava all'Osservatorio Lowell.
  • Andrew Ellicott Douglass o A. E. Douglass (* 5 de julio de 1867, Windsor, Vermont – 20 de marzo de 1962, Tucson, Arizona), fue un astrónomo estadounidense y fundador del Laboratory of Tree-Ring Research (Laboratorio de Investigación de los Anillos de Árboles) en la Universidad de Arizona. Desarrollo las técnicas de fechados dendrocronológicos.
  • A. E. (Andrew Ellicott) Douglass (July 5, 1867, Windsor, Vermont – March 20, 1962, Tucson, Arizona) was an American astronomer. He discovered a correlation between tree rings and the sunspot cycle."Douglass tracked this into past centuries by studying beams from old buildings as well as Sequoias and other long-lived trees.
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  • Andrew Ellicott Douglass
  • A. E. Douglass
  • A. E. Douglass
  • Andrew Ellicott Douglass
  • Andrew Ellicott Douglass
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