[en] The theory of the rotational motion of the earth's crust indicates the presence of the eulerian term beyond the chandlerien term and the annual term. The astronomers thought, this nutation of 304 days turned into 431 days. The author wanted to ensure, by means of Greenwich's latitudes, that we didn't note the period of 304 days. For him, after works, there are three periods; 304, 365 ad 431 days and the three nutations have approximately the same importance. [fr] La théorie du mouvement de rotation de l'écorce terrestre indique la présence du terme eulérien en dehors du terme chandlérien et du terme annuel. Les astronomes ont pensé que cette nutation de 304 jours s'est transformée en 431 jours. Mais l'auteur a voulu s'assurer, au moyen des latitudes de Greenwich, qu'on ne constatait pas la période de 304 jours. Pour lui, après travaux, il existe donc trois périodes; 304, 365 et 431 jours et les trois nutations ont à peu près la même importance.
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