Position of the sun in the sky at noon on winter solstice, lowest seasonal travel
Lines D1 & D2 are parallel
Figure 2: Angles of the Sun and Cast Shadows
Tilt of the Earth's axis in relation to the sun is 23° 27' (rounded off to 23° for our purposes)
Angle of the sun in the northern sky on the day of summer solstice
Position of the sun at northern extreme of travel on summer solstice
Sun directly overhead two times a year
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