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[–] bilabrin2 0 points 1 points (+1|-0) ago 

Relative to what?

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[–] photonasty [S] 0 points 1 points (+1|-0) ago 

To the rest of the galaxy, I think. The sun, like other stars, rotates around the galactic center, so I think this diagram shows the Earth's motion through the galaxy as it orbits the sun.

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[–] SkeletonHand 0 points 1 points (+1|-0) ago 

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[–] TimmyTimes 0 points 0 points (+0|-0) ago 

Yeah that would be my guess.

Source: I did a project on Neptune in grade 7.