On Thursday, July 21, 2016 at 1:16:18 AM UTC-6, Gerald Kelleher wrote:
I am getting so careless these days - the North and South poles don't rotate
to the Sun as a function of daily rotation but they do rotate to the Sun as a
function of the planet's orbital motion.

That depends on what you mean by "rotate". The North and South poles don't
_move_ as a result of daily rotation - because they're on the axis that pivots
it - but the orientation in relation to the Sun of a person standing at the
South Pole would change in a cycle of 24 hours.

Of course, one could say that a mathematical point, having no internal
structure, can't really rotate.

John Savard