Is this question about orbit arc length and elliptic integrals on-topic, or is there a form of it that would be on-topic?

Question

I found summat and would like to share it, so others may avoid the waste of time I spent sorting it out.

See broken link here and broken link here (see comment below).

Is that on-topic? I have a feeling it is too much like a discussion or poll question, even though I try to avoid that.

Could I instead make it a question specifically about the topic (e.g. how do I calculate arc length along an orbital path?) that I answer myself?

Thanks.