I'm figuring that the low-rent planets, stars, etc. in the vague vicinity of an actual black hole would provide a fine frame of reference.
> Plus you can just "rotate" a black hole to get it to have the same spin axis as...
Quip: If you have the tech & budget to meaningfully rotate a spinning black hole, then you've got the tech & budget to change the other parameters, too.
> Plus you can just "rotate" a black hole to get it to have the same spin axis as...
Quip: If you have the tech & budget to meaningfully rotate a spinning black hole, then you've got the tech & budget to change the other parameters, too.
FWIW - Wikipedia's answer is that 11 numbers (or 2 scalars and 3 vectors) are needed to fully spec. a stable black hole - https://en.wikipedia.org/wiki/Rotating_black_hole#Types_of_b...