inscription
Portail d'information géographique

Résultats de la recherche (48 résultats)

Affinez votre recherche

Par Collection Par Auteur Par Date Par Sujet Par Titre
Brunhes-Matuyama magnetic reversal dated at 790,000 yr B.P. by marine-astronomical correlations
  • Brunhes-Matuyama magnetic reversal dated at 790,000 yr B.P. by marine-astronomical correlations
  • The presence of the Brunhes-Matuyama magnetic reversal in deep-sea core sediments makes possible an alternative to the usual K/Ar radioisotope method of dating the reversal as found in rocks. The alternative method uses correlations of Northern
  • Hemisphere summer insolation with oxygen-isotope ratios from tropical cores. The latitude-dependent insolation variations are calculated from planetary mechanics and thus provide a highly accurate astronomical time scale. The insolation variations strongly
  • is supported by a resulting consistent identification of principal isotope-ratio peaks with high-and low-latitude coincident insolation maxima. The Brunhes-Matuyama reversal is found in interglacial Stage 19, and is dated on the astronomical time scale
The astronomical theory of paleoclimates in Climatic variations and variability: facts and theories.
  • The astronomical theory of paleoclimates in Climatic variations and variability: facts and theories.
  • Recent objective comparison in the time and frequency domains between ice-volume, paleotemperature and insolation curves strongly support the astronomical theory. Related physical models are also able to reproduce past climate variations
Klavdij Ptolemej, II vek n. e.. Claude Ptolémée, IIeme siècle de notre ère
  • Astronome ; Biographie ; Géocentrisme ; Géographe ; Histoire de la géographie ; PTOLEMEE (C.) ; Siècle 2
  • Vie et oeuvres de l'astronome et géographe grec. Un chapitre est consacré à ses travaux en géographie. L'ouvrage expose la théorie du géocentrisme de Ptolémée, face à l'héliocentrisme de Copernic et de Kepler. - (FC)
Paleoclimatic, paleomagnetic and paleogeoidal changes: complexity and interaction in Evolution des atmosphères planétaires et climatologie de la terre=Evolution of planetary atmospheres and climatology of the earth.
  • of the geomagnetic pole: during ice ages the pole was in the Siberian-Arctic region. There is a close correlation between paleomagnetic and paleogeoid changes implying a mutual origin in core/mantle changes. The astronomical variables in the Earth/Sun constellation
  • France) offers a unique paleoclimatic and paleomagnetic record of the last 130,000years. Several geomagnetic excursions are recorded implying rapid motions at the core/mantle interface. The data reveal a correlation between paleoclimate and the position
Der Astronom der Herzogin. Leben und Werk von Franz Xaver von Zach
  • Der Astronom der Herzogin. Leben und Werk von Franz Xaver von Zach
  • L'astronome de la duchesse. La vie et les travaux de Franz Xaver von Zach 1754-1832
  • Astronome ; Biographie ; Cartographie ; Géodésie ; Géographie ; Histoire de la cartographie ; Siècle 18 ; Siècle 19 ; VON ZACH (F.X.)
  • L'astronome, géodésien et géographe F.X. von Zach est né dans la ville hongroise de Pest. Il a mené une existence tumultueuse et a vécu en différents lieux d'Autriche-Hongrie, d'Allemagne, d'Italie et de France où il est mort à paris en 1832 (il est
Georg von Neumayer (1826-1909) and his astronomical activity in Australia
  • Georg von Neumayer (1826-1909) and his astronomical activity in Australia
Herschel, musico y astronomo (Sir William Herschel, musicien et astronome)
  • Herschel, musico y astronomo (Sir William Herschel, musicien et astronome)
Approche astronomique des variations climatiques: les variations mensuelles et en latitude de l'insolation de 130.000 à 100.000 et de 30.000 à aujourd'hui. in Paléoclimats. (Astronomical approach of paleoclimatic variations: monthly and latitudinal variations of insolation from 130,000 to 100,000 and from 30,000 until the Present)
  • Approche astronomique des variations climatiques: les variations mensuelles et en latitude de l'insolation de 130.000 à 100.000 et de 30.000 à aujourd'hui. in Paléoclimats. (Astronomical approach of paleoclimatic variations: monthly and latitudinal
Neotectonics and current hydrologically-induced karst deformation. Case study of the Plateau de Calern (Alpes-Maritimes, France)
  • The astronomical and geodetic observatory OCA, located on the karst plateau of Calern (Caussols, France), has been monitoring earth deformation for several years. Two medium baseline tiltmeters have been installed in a shaft in 2007, along
  • with classical hydrogeological monitoring tools in order to investigate the relationship between current karst deformation and hydrology. The best correlation between hydrology and tilts is observed for the deep aquifers. Finally, the long term variations in tilt
  • and water table show a very good correlation The relationship between current hydrological deformations and tectonics is also analyzed; broken and shifted speleothems in the shafts indicate a general shift of the plateau towards the south.
Frölich Dávid (1595-1648)
  • This is a bibliographic paper about the life and work of david Frölich, the famous late humanist mathematician, astronomer, calendar maker and geographer. Frölich contributed significantly to the wider geographical knowledge of his age - (JS)
Some problems of geodynamics and methods for their solution
  • The author discusses global geokinetic processes and proposes to establish a joint commission of astronomers-geodesists and geologists-geophysicists in order to solve the problems.
Jean-Henri Lambert, le mal aimé
  • L'itinéraire intellectuel d'un homme de science du XVIIIsiècle, J. H. Lambert, philosophe, astronome et initiateur de la cartographie scientifique.
Claude Ptolémée, astronome, astrologue, géographe : connaissance et représentation du monde habité
  • Claude Ptolémée, astronome, astrologue, géographe : connaissance et représentation du monde habité
Geography and the Paris Academy of Sciences : politics and patronage in early 18th-century France
  • the Academy's epistemological foundations and prompted a debate about the educational and political significance of geography as a scientific practice. It shows that the death in 1726 of Guillaume Delisle, a prominent Academy astronomer, led to a spirited
  • campaign to elect Philippe Buache, to a new Academy position as a geographer rather than an astronomer. It concludes that this campaign emphasised the social and political utility of geography, though the Academy's decision to recognise this new
Astronomical forcing of contrasting rainfall changes in tropical South America between 12,400 and 8800 cal yr B.P.
  • Astronomical forcing of contrasting rainfall changes in tropical South America between 12,400 and 8800 cal yr B.P.
Approche astronomique de l'écologie humaine préhistorique: reconstitutions des insolations au Würm récent en Périgord. in Paléoclimats. (An astronomical approach to human prehistoric ecology: quantitative insolation at Late Würm in south-west France)
  • Approche astronomique de l'écologie humaine préhistorique: reconstitutions des insolations au Würm récent en Périgord. in Paléoclimats. (An astronomical approach to human prehistoric ecology: quantitative insolation at Late Würm in south-west France)
Changes of beginning and duration of year seasons
  • All factors affecting lenght of astronomical year seasons duration are described. Among the most important ones belong inclination of the Earth axis, changes of the Earth speed during its revolution around the Sun on the elliptic orbit, changes
Muslim contributions to geography until the end of the 12th century AD
  • people helped to further knowledge of many new areas. The three main contributions concern descriptive geography, astronomical and mathematical geography, cartography.
U-series dating of Last Interglacial high sea stands : Barbados revisited
  • This study documents the need of dating coral with the high precision/sensitivity mass-spectrometric techniques for future resolution of the temporal relationships among sea level changes, climate oscillations, and astronomical forcing-relationship
Milankovitch theory of Ice Ages: hypothesis of ice-sheet linkage between regional insolation and global climate
  • It is proposed that interlocked variations of ice-sheet sinks in both polar hemispheres amplified and transmitted Milankovitch summer half-year insolation changes (a version of the astronomical theory) between 45 and 75 N into the globally