Special Locations on the Earth
•How close to the North Pole do we need to go before the Summer Solstice sun becomes a “circumpolar star” and is above the horizon all day?
•Within 23.5o of the pole:    THE ARCTIC CIRCLE
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•How close to the equator do we need to get before the Summer Solstice sun passes directly rather than somewhat to the south:
•Within 23.5o of the equator:  The TROPICS
(From our Text:  Horizons, by Seeds)