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Planetary Bulletin No. 10 -2- JUPITER: The giant planet was observed well this year. By comparing observa- tions, I am working out a correlation between the darkness of the Southern Equatorial Belt and the position of Callisto. It appears to be a valid correlation but many observations are needed. The Planetary Section has furnished three dozen satellite timings of the four Galilean satellites to the Observatorio de Valonge of the Brazilian National Uni- versity at Rio tie Janeiro. Again this was set up by the I.U.A.A. This all goes to prove that our observations really are of value -- if reported. SATURN: A report of the work of the Section on Saturn will appear in a forth- coming issue of the JOURNAL. Saturn is getting into a favourable position for observing, so I hope that you will start making those Intensity and magnitude estimates soon. THE LAST WORD The response to these bulletins has been most encouraging. Just one or two Centres have not written some form of acknowledgement, so, PLEASE - if your Centre is one of these, write a note to tell me what you are doing in the way of Planetary observing, even if it is nothing! Don't forget - communication between Centres was the big issue at the recent General Assembly. Kenneth E. Chilton, National Co-ordinator, Planetary Section, Standing Committee of Co-ordination of Centre Activities, 93 Currie Street, Hamilton 57, Ont. Phone: 416-388-0586. 14 August, 1969.