If you couldn't see planets or stars...

[l3p3r]

Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>Still, I'm not seeing any evidence that says "heliocentric" here.&nbsp; Just that bodies rotate in place, and can move about the earth (or stay stationary).&nbsp; Nothing makes more sense by saying the earth orbits the sun than vice versa. Granted, nothing rules it out, other than the fact that we're on earth, and we don't feel like we're moving.&nbsp; Can't say that for the other two objects. <br /> Posted by Saiph</DIV>But this is where the test comes in - if you just happen to fire something in to space tangential to Earth's orbit (in the opposite sense to the orbit) you would find the object falling into the sun. It wouldn't take long to work out that the influence of the sun is a lot greater than the influence of the Earth, and the parallax information you get from your probe can help you range the sun and estimate it's mass based on what we'd already know about gravity from the Earth-Moon system. It would quickly become clear that the sun was the dominant object in the system.<br /> <div class="Discussion_UserSignature"> </div>