[zfedoran]

Awesome work! Thanks for sharing this!

Reminds me of nova.astrometry.net and PixInsight (and others), which are able to determine which stars are in an image, regardless of transforms.

Relevant paper (outlines an approach using triangle space): https://hal.inria.fr/inria-00548539/document

Relevant section: "Provided the reduced object lists, our next step is to construct all possible triangles. From the list of n objects we can construct n(n − 1)(n − 2)/6 triangles. Those will be represented in so called "triangle space". We need to choose a triangle representation that will let us find similar triangles, that is to find corresponding object triplets being insensitive to translation, rotation, scaling and flipping. A triangle in the triangle space could be represented as a two-dimensional point (x, y) where x = a/b, y = b/c.

a, b and c are the lengths of triangle sides in decreasing order. Similar triangles will be located close to each other in the triangle space."