NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Planet positions and light travel time
From: Don Seltzer
Date: 2017 Dec 18, 11:13 -0500
From: Don Seltzer
Date: 2017 Dec 18, 11:13 -0500
This correction was first noted in the 1600's. The orbits of Jupiter's moons had a seasonal time wobble. They ran minutes ahead of mathematical predictions when the earth was closest to Jupiter, and lagged when the earth was on the far side of its orbit. From this data the first ballpark estimate of the speed of light was made.
Don Seltzer
