Peter Wakelin has filled in my observation gap during August. There is a revised plot here: http://www.zarya.info/Tracking/USA179/USA1792007H2.php The plot of ndot/2 is interesting. I assume it is driven by an acceleration effect that maximises (positive or negative) when the Sun is in the plane of the orbit: http://www.zarya.info/Tracking/USA179/USA179deltaN.php Bob Christy ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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