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I'm with Bojan on this.
The earth's rotation on its axis does not significantly effect the sun gravitation field (other than the miniscule/negligible amount of spacial frame dragging), nor the apparent position of the sun.
Yes it takes 8 minutes for the light from the sun to reach earth, and yes the sun is moving in space. The Earth also has a component of its motion that is exactly the same as the motion of the sun in space - so for the relative positions of the earth to the sun in the reference frame of the solar system, the sun appears exactly where it is/was 8 minutes ago.
What your experiment is really demonstrating (if you reverse the direction of offset), is where the sun appeared in the sky (relative to the rotating reference frame of the earth) when the light left the sun.
Al.
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