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The circle of illumination always includes 180 degrees of latitude (and 180 degrees of longitude).

Considering latitude . . . whatever amount of latitude falls outside of the circle because of

the Earth's so-called "tilt" is made up for by the circle extending the same number of degrees

past the pole on the other end.

Examples:

-- Equinoxes: Illumination from 90 degrees south to 90 degrees north latitude. Total = 180 degrees of latitude.

-- June solstice: from 66.5 degrees south, over the north pole, past 90 degrees north,

and back down the other side to 66.5 degrees north. Total = 180 degrees of latitude.

-- December solstice: fropm 66.5 degrees north, under the south pole, past 90- degrees south,

and back up the other side to 66.5 degrees south. Total = 180 degrees of latitudfe.

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