Here's some insight into measurement of jovian rotation back in the good old days. A wee bit more sophisticated than looking at the Great Red Spot.
Gardner, FF & Shain, CA (1958). Further Observations of Radio Emission from the Planet Jupiter. Australian Journal of Physics 11(1) 55-69. On Saturday, July 9, 2016, jimlux <[email protected]> wrote: > http://www.space.com/4314-length-saturn-day-revised.html > > They measure some presumed solid(ish) center. > > If the magnetic field axis and the rotation axis are displaced, you can > measure when the magnetic field goes by. Or by radio sources. > > Jupiter day length at the poles is slightly longer than day length at > equator, but it's about 1% 9 hr 56 min vs 9 hr 50 min. > > I figure the Jupiter day length (which has been given as about 10 hours > for a very long time, certainly before we sent spacecraft nearby) is > probably from visual observation of the Great Red Spot. You can easily see > it move in a not very big telescope over the course of a night. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > -- I am Pulse. Unbreakable. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
