J.V. Field has told me about the following website, which might be of interest - Tony
Christopher Arthur, a maths graduate from Texas who is now a computer programmer and has an interest in Kepler, has written a program that uses NASA's ephemeris information and the method of reduction given in Kepler's _Harmonice mundi_ to derive a musical version of the current state of the resonances among the motions of the planets. The sounds will doubtless not make it to the Top Ten, but I thought they might be of interest as a demonstration of a known phenomenon. The web address is
Kepler's method conforms perfectly with desirable modern scientific standards, involving no fudging of any kind. (Kepler thought that lying was a sin.) To get the various notes within the same octave he simply subtracts whole octaves as required. His write-up, in which he is using the planetary speeds he has deduced from Tycho Brahe's observations, is in _Harmonice mundi_ (Linz. 1619), Book 5 (English translation: Johannes Kepler, _The Harmony of the World_, translated into English with an introduction and notes, by E. J. Aiton, A. M. Duncan and J. V. Field, _Memoirs of the American Philosophical Society_, vol. 209, Philadelphia, 1997. ISBN 0-87169-209-0, US ISSN 0065-9738).
-- Tony Mann Head of Department, Mathematical Sciences, School of Computing and Mathematical Sciences, The University of Greenwich, Maritime Greenwich University Campus, Old Royal Naval College, Park Row, Greenwich, London SE10 9LS Tel: +(44) (0)20 8331 8709, Fax: +(44) (0)20 8331 8665 Email: A.Mann@gre.ac.uk, website: www.gre.ac.uk/~A.Mann