We can fix the linguistic ambiguity by either having the Earth orbiting at much larger radius or spinning much faster around its axis. This makes the length of

We can fix the linguistic ambiguity by either having the Earth orbiting at much larger radius or spinning much faster around its axis. This makes the length of day/night less relevant. Ofcourse the strictly correct result is only obtained in the asymptotic limit of infinite orbital radius or infinite rotation speed. The first option seems problematic. While the rotational period becomes infinitesimal vs orbital, in the limit there is no orbital motion at all, not to mention that cosmological considerations come into play. But the second option brings other difficulties, like people being ejected into space from the infinite centripetal force. Its a tough one.