On Mar 20, 9:36*pm, Paul Schlyter wrote:
On Tue, 20 Mar 2012 19:59:28 +0100, "Gavino"

wrote:
Actually, because of atmospheric refraction, the Sun rises at the
North Pole a
few days before the equinox, and similarly sets at the South Pole a
few days
after, being fully visible at both poles on the day of the equinox.

"A few days" is here approximately 1.5 days.

Schlyter ,if you were any sort of a proper astronomer you would have
moved the orbital cycle towards our latitudes where it combine with
the daily rotational cycle to account for the variations in the
natural noon cycle.The trick is to separate the axis of rotation for
both cycle seeing that the North/South poles represent null daily
rotation yet turn around a traveling axis and cause polar day to turn
to polar night by turning through the circle of illumination and
either towards or away from the Sun.