30 Dec
2007
30 Dec
'07
1:26 p.m.
The bad news is that since that period changes significantly depending on the sun-earth-Jupiter orientaion, it complicates the cheat-sheet. On Dec 30, 2007 1:15 PM, Chuck Hards <chuck.hards@gmail.com> wrote:
That period seems very close to the combined times of Io being in Jupiter's shadow and behind the planet's disk itself, in a specific orientation (Jovian system orientation with respect to earth). You might see if it matches up on the night Romer made the timings.