[Southack]

"157 miles per second"

Times 8.3 minutes = 78,186 miles (for some reason I had it in my head that the Sun traveled 270,000 miles in the time that it took Light to reach Earth from the Sun, bizarre).

So the question is whether the Earth rotates in an orbital plane around where the Sun was 8.3 minutes ago, which will always be 78,186 miles away from its current position (if your math is valid), or whether the Earth orbit is centered more closely to the actual position of the Sun at the present time.

And that answer will tell us the speed of Gravity.

[RadioAstronomer]

So the question is whether the Earth rotates in an orbital plane around where the Sun was 8.3 minutes ago, which will always be 78,186 miles away from its current position (if your math is valid), or whether the Earth orbit is centered more closely to the actual position of the Sun at the present time.

Remember it takes one year for the earth to orbit the sun once. Visualize it as a combined system (earth/sun) orbiting about a common point of mass moving as a whole relative to the center of the galaxy. Don't forget the galaxy is also moving linearly as a "whole" as well.