Spherical astronomy; Motion; Earth’s crust; 20th century; Earth's fluidity; Astronomie sphérique; Mouvement; Écorce terrestre; 20e siècle; Fluidité de la Terre
Abstract :
[en] The spherical astronomy of the 19th century was based on the formulae of Bessel. The author exposes those of the 20th century. The superficial fluidity of the Earth being established, by geology and the existence of diurnal nutation, this is the theory of motion of the crust that forms basis to the spherical astronomy. [fr] L’astronomie sphérique du 19e siècle reposait sur les formules de Bessel. L’auteur expose celles du 20e siècle. La fluidité superficielle de la Terre étant établie, par la géologie et par l’existence de la nutation diurne, c’est la théorie du mouvement de l’écorce qui sert de base à l’astronomie sphérique.
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