On Mar 20, 6:59*pm, "Gavino" wrote:
"oriel36" wrote in message

...

http://www.timeanddate.com/worldcloc...omy.html?n=468

... cause the Sun to set tomorrow at the South Pole and rise at the North.

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.

You are fine.This type of modification which replaces a nondescript
'tilt'* with an additional orbital day/night cycle and its quasi-
rotational cause arising solely from the orbital behavior of the
planet would only appeal to astronomers and they have proven difficult
to find or don't exist at all.The orbital 'sunrise/sunset' at the
polar latitudes is a window into the orbital behavior of the planet so
we are dealing with large scale planetary dynamics and leave
refraction to those who generally can't raise themselves to the
discipline of Copernicus,Kepler and Galileo.




* "An equinox occurs twice a year, when the tilt of the Earth's axis
is inclined neither away from nor towards the Sun, the center of the
Sun being in the same plane as the Earth's equator." Wikipedia