Paper, regarding observations of Jupiter's satellites and Saturn's rings with reflecting telescope by John Hadley Recounts the observations of the shadows cast on Jupiter and Saturn by their satellites, and the the shadow cast by Saturn on it rings. Subject: Astronomy Extracted from the minutes of 6 April 1721 Read to the Royal Society on 6 April 1721 Published in Philosophical Transactions as 'Observation on the Satellites of Jupiter and Saturn, made with the same telescope' 1721