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- Joseph_Adhémar abstract "Joseph Alphonse Adhémar (1797–1862) was a French mathematician. He was the first to suggest that ice ages were controlled by astronomical forces in his 1842 book Revolutions of the Sea.The Earth's orbit is elliptical, with the Sun at one focus; lines drawn through the summer and winter solstice; and the spring and autumn equinox; intersect with the sun at right angles. The Earth is closest to the Sun (perihelion) near the northern hemisphere winter solstice. The earth moves faster through its orbit when closer to the sun. Hence, the period from the northern hemisphere's autumn equinox to winter and spring is shorter by around seven days than the period from spring to summer to autumn; the reverse is true in the southern hemisphere. Hence, northern hemisphere winter is shorter.Because of this, Adhemar reasoned that because the southern hemisphere had more hours of darkness in winter, it must be cooling, and attributed the Antarctic ice sheet to this. Adhemar knew of the 22,000 year cycle of precession of the equinoxes, and theorised that the ice ages occurred in this cycle.One immediate objection to the theory was that the total insolation during a year does not vary at all during the precessional cycle, only its seasonal distribution. Another was that the timing was wrong; however this could not be tested by observations available at the time.Adhemar's theory was further developed, first by James Croll and later by Milutin Milanković.Adhemar predicted the Antarctic ice sheet and theorised about its thickness by comparing the depths of the Arctic and circum-Antarctic oceans. Finding the Antarctic oceans deeper (the measurements he used may not have been fully representative) and attributing this to the gravitational attraction of the Antarctic ice sheet, he postulated a truly enormous ice sheet approximately 90 km thick.".
- Joseph_Adhémar field Mathematics.
- Joseph_Adhémar thumbnail Flag_of_France.svg?width=300.
- Joseph_Adhémar wikiPageID "373812".
- Joseph_Adhémar wikiPageLength "3340".
- Joseph_Adhémar wikiPageOutDegree "29".
- Joseph_Adhémar wikiPageRevisionID "702941218".
- Joseph_Adhémar wikiPageWikiLink Antarctica.
- Joseph_Adhémar wikiPageWikiLink Astronomy.
- Joseph_Adhémar wikiPageWikiLink Axial_precession.
- Joseph_Adhémar wikiPageWikiLink Axial_tilt.
- Joseph_Adhémar wikiPageWikiLink Category:1797_births.
- Joseph_Adhémar wikiPageWikiLink Category:1862_deaths.
- Joseph_Adhémar wikiPageWikiLink Category:19th-century_French_mathematicians.
- Joseph_Adhémar wikiPageWikiLink Category:French_climatologists.
- Joseph_Adhémar wikiPageWikiLink Ellipse.
- Joseph_Adhémar wikiPageWikiLink Equinox.
- Joseph_Adhémar wikiPageWikiLink File:Flag_of_France.svg.
- Joseph_Adhémar wikiPageWikiLink Gravity.
- Joseph_Adhémar wikiPageWikiLink Ice_age.
- Joseph_Adhémar wikiPageWikiLink Ice_sheet.
- Joseph_Adhémar wikiPageWikiLink James_Croll.
- Joseph_Adhémar wikiPageWikiLink Mathematician.
- Joseph_Adhémar wikiPageWikiLink Mathematics.
- Joseph_Adhémar wikiPageWikiLink Milutin_Milanković.
- Joseph_Adhémar wikiPageWikiLink Northern_Hemisphere.
- Joseph_Adhémar wikiPageWikiLink Orbit.
- Joseph_Adhémar wikiPageWikiLink Perihelion_and_aphelion.
- Joseph_Adhémar wikiPageWikiLink Precession.
- Joseph_Adhémar wikiPageWikiLink Right_angle.
- Joseph_Adhémar wikiPageWikiLink Solar_irradiance.
- Joseph_Adhémar wikiPageWikiLink Solstice.
- Joseph_Adhémar wikiPageWikiLink Southern_Hemisphere.
- Joseph_Adhémar wikiPageWikiLink Winter_solstice.
- Joseph_Adhémar wikiPageWikiLinkText "Joseph Adhémar".
- Joseph_Adhémar birthDate "February 1797".
- Joseph_Adhémar birthPlace "Paris, France".
- Joseph_Adhémar caption "Joseph Adhemar".
- Joseph_Adhémar deathDate "1862".
- Joseph_Adhémar deathPlace "Paris, France".
- Joseph_Adhémar field Mathematics.
- Joseph_Adhémar name "Joseph Adhemar".
- Joseph_Adhémar nationality "20".
- Joseph_Adhémar residence "20".
- Joseph_Adhémar wikiPageUsesTemplate Template:Authority_control.
- Joseph_Adhémar wikiPageUsesTemplate Template:Infobox_scientist.
- Joseph_Adhémar wikiPageUsesTemplate Template:Reflist.
- Joseph_Adhémar subject Category:1797_births.
- Joseph_Adhémar subject Category:1862_deaths.
- Joseph_Adhémar subject Category:19th-century_French_mathematicians.
- Joseph_Adhémar subject Category:French_climatologists.
- Joseph_Adhémar hypernym Mathematician.
- Joseph_Adhémar type Agent.
- Joseph_Adhémar type Person.
- Joseph_Adhémar type Scientist.
- Joseph_Adhémar type Person.
- Joseph_Adhémar type Geographer.
- Joseph_Adhémar type Mathematician.
- Joseph_Adhémar type Redirect.
- Joseph_Adhémar type Agent.
- Joseph_Adhémar type NaturalPerson.
- Joseph_Adhémar type Thing.
- Joseph_Adhémar type Q215627.
- Joseph_Adhémar type Q5.
- Joseph_Adhémar type Q901.
- Joseph_Adhémar type Person.
- Joseph_Adhémar comment "Joseph Alphonse Adhémar (1797–1862) was a French mathematician. He was the first to suggest that ice ages were controlled by astronomical forces in his 1842 book Revolutions of the Sea.The Earth's orbit is elliptical, with the Sun at one focus; lines drawn through the summer and winter solstice; and the spring and autumn equinox; intersect with the sun at right angles. The Earth is closest to the Sun (perihelion) near the northern hemisphere winter solstice.".
- Joseph_Adhémar label "Joseph Adhémar".
- Joseph_Adhémar sameAs Q983376.
- Joseph_Adhémar sameAs Joseph_Adhemar.
- Joseph_Adhémar sameAs Joseph-Alphonse_Adhémar.
- Joseph_Adhémar sameAs Joseph-Alphonse_Adhémar.
- Joseph_Adhémar sameAs Joseph_Adhemar.
- Joseph_Adhémar sameAs Joseph-Alphonse_Adhémar.
- Joseph_Adhémar sameAs Joseph-Alphonse_Adhémar.
- Joseph_Adhémar sameAs Joseph-Alphonse_Adhémar.
- Joseph_Adhémar sameAs Alphonse_Joseph_Adhemar.
- Joseph_Adhémar sameAs m.020sh6.
- Joseph_Adhémar sameAs Joseph_Adhemar.
- Joseph_Adhémar sameAs Адемар,_Альфонс_Жозеф.
- Joseph_Adhémar sameAs Q983376.
- Joseph_Adhémar wasDerivedFrom Joseph_Adhémar?oldid=702941218.
- Joseph_Adhémar depiction Flag_of_France.svg.
- Joseph_Adhémar isPrimaryTopicOf Joseph_Adhémar.
- Joseph_Adhémar name "Joseph Adhemar".