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cool name. I love frank herbert.
Aside from rotation, there is another invariant between the two sets which is much simpler to calculate and allows it to become a matching problem. I think it's worth pointing this out because it is really possible on this kata to get lost in linear algebra.
I have some questions regarding this kata, but first let me say I am intrigued. I see the catalog array item matches the star array items on the answer. I have looked up the unit sphere, and 'think' I understand the conversion of the RA/DEC to the decimal, though I have not yet found how to perform this conversion mathematically or programmatically (obviously). Looking up the RA/DEC was quite interesting, as I have no background in astronomy yet love space things.
Can anyone point out where I might begin to do the background research and study to solve this kata? I am fascinated...
I'm able to derive rotation matrix R between any pair o and c that are given in the answer, however this R is different for each answer pair! I have no idea what I'm doing wrong or how that's even possible.
I also feel this could benefit from some links describing the theory of the geometry. Although it's probably pretty basic from a 3d graphics point of view, I have no experience with that.