Paper, 'The late observations of Saturn' by Robert Hooke Description of observations of Saturn by Robert Hooke, observations made with a 60-foot telescope on 29 June 1666 between 11 and 12pm. Describes the rings appearing lighter than the body of the planet. Figure in text. Subject: Astronomy Read to the Royal Society on 11 July 1666, and ordered to be registered Published in Philosophical Transactions as 'Some observations, lately made at London, of the planet Jupiter: as also of Saturn.' 1666