nutation

[1932] Discovery of the Main Nutation of the Earth's Axis ; James Bradley ; George Sarton ; ISIS 17 (1932) p. 333 [lien]
[1970] The Chandlerian Nutation ; R. G. Hipkin ; Quarterly Journal of the Royal Astronomical Society 11 (1970) p. 43 [lien]
[2011] Polar motion measurement at the Observatoire de Lyon in the late nineteenth century ; Emmanuel P├ęcontal ; Studies in History and Philosophy of Science Part A 42 (2011) p. 94 [lien]