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March 21
Sun
June 21
December 21
September 21
Figure 1.8 Annual revolution of the Earth around the Sun. Source: Based on an image
in Kolars, John F. and Nystuen, John D., Human Geography: Spatial Design in World
Society, Englewood Cliffs: McGraw-Hill, 1974. Original drawings by Derwin Bell.
solstices or “sun stops” because for a few days, depending on the hemisphere,
and whether it is the summer or winter solstice, the sun stops getting higher
in the sky with each successive solar noon or stops getting lower in the sky
(depending on hemisphere).
Figure 1.9 shows a closer view of the detail of the tilt of the Earth's polar
axis in relation to the plane of the ecliptic. Latitude and longitude measure
23.5
66.5
23.5
66.5
23.5
Sun
Plane of Ecliptic
66.5
Figure 1.9 Angular measure associated with tilt of the Earth's polar axis. Source:
Based on an image in Kolars, John F. and Nystuen, John D., Human Geography:
Spatial Design in World Society, Englewood Cliffs: McGraw-Hill, 1974. Original
drawings by Derwin Bell.
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