Motion of the Earth as viewed from the moon and the Y-suspended pendulum

Details Motion of the Earth as viewed from the moon and the Y-suspended pendulum Motion of the Earth as viewed from the moon and the Y-suspended pendulum

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981amjph..49..452c&link_type=abstract

American Journal of Physics, Volume 49, Issue 5, pp. 452-454 (1981).

Physics

8

Rotational Variations, Polar Wobble

Scientific paper

In the early nineteeth century, James Dean, the first Professor of Mathematics and Natural Philosophy at the University of Vermont, published a paper describing the effects of the librations of the moon on the apparent motion of the Earth in the sky of the moon. He noted that this motion could be simulated by the motion of a Y-suspended pendulum. Within a short time, Nathaniel Bowditch, the self-taught mathematician, navigator, and actuary, published a complete analysis of the two-dimensional oscillator, including derivations and drawings of the mathematical curves usually known as Lissajous figures, some forty years before their description by J. A. Lissajous. This paper gives an account of the contributions of Dean and Bowditch to this problem.

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