> At less than 90 degrees (anyone know the longitude?), the earth's rotation comes back into effect and the sun does go "behind the earth", i.e. it sets, daily,

> At less than 90 degrees (anyone know the longitude?), the earth's rotation comes back into effect and the sun does go "behind the earth", i.e. it sets, daily, for a few months. I was wondering too. It looks like it's at about 84 degrees that there is a normal day night cycle (for some definition of normal, there is only a few minutes of daylight at the winter solstice).