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Old 06-15-2016, 06:43 PM
Blue Blistering Barnacle Blue Blistering Barnacle is offline
Join Date: Dec 2011
Posts: 5,234
Originally Posted by dtilque View Post
Not really sure. The annual increase (15 cm/year) was calculated by a couple Russians (Gregoriy A. Krasinsky and Victor A. Brumberg) using (I think) timing of comunications to interplanetary probes. This paper says that it is probably due to tidal drag. I'm going to guess that it mainly shows up in a change in the semi-major axis.

Semi-major- does that mean the orbit becomes more elliptical with time?