[ben_w]

> [0] If I've done the maths right:

I now think my assumption is wrong, that the closest you can get without worrying about night is minimal bounding square, not a minimal bounding triangle, so the orbital altitude should be:

(sqrt(2) * radius) - radius = (sqrt(2) - 1) * radius ~= 2639 km

so a factor of about 14 better than GEO.