Are the heavenly bodies moving faster for some observers?

Imagine someone going very fast near the speed of light. Ten years for us is 1 year for this guy.
Question: how many times did the Earth go around the sun in the referenceframe of the moving observer?
One time, isn't it?
While we have seen ten summers.

Isn't that weird? All the heavenly bodies go slower in the referenceframe of the moving observer because of timedilation.

Ok, some people will say: where is the math?
Here is the math:

n the frame of the Earth:
Position Earth-sun on 1 januari 0:00h GMT.
Event 1: 1 january: x = 0, t=0; Event 2: 1 jan next year: x=0, t=T, duration T = 1 year

Het inertial frame of moving observer: x', t', velocity v:
t'=y(t-vx/c2). vx/c2 remains the same (0), so duration is T' = yT (gamma year).

All the heavenly bodies go slower for the moving observer... Everything in the sky moves slower in the moving frame. The duration is longer.
I just had one summer and you had ten summers... So, the position of the Milkey Way is different for different observers...

Or not? That's the question.

via International Skeptics Forum http://ift.tt/1Pvxhdc