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Kepler Field of View

I'm looking for a way to take stellar coordinates (right ascension / decliniation) and plot them, so that they look like the picture below.

The trick here, is that I'd like the Kepler's field of view (those little squares) to remain squares, rotated and distorted appropriately.

A normal stellar projection (e.g. from here) look great, but results in distored squares, as shown in the second picture.

Any thoughts about how to plot this correctly?

(Looks like I can't inline the images since I'm a new user. If someone wants to add them to the post that would be great).

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