Rationale for 2D world in which planets don't move

[WendellM]

quote:

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The planets and warp points *do* rotate.
(hands start waving about to help the explanation)

However, to keep everything simple, the viewport spins so that we always see one direction as "up" [...]
(hands speed up)

Obviously, this is inconsistent with basic orbital mechanics as we know them [...]
(hands begin to blur)

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Bu-wa-ha-hah! A fine example of figurative (as well as literal) "hand waving" as practiced by some real astronomers/cosmologists when trying to sell their pet theories! Quite funny....