Earth Latitudes - It is not a perfect sphere technically it...

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Latitude The Equator lies at 0° The North Pole - 90° North The South Pole - 90° South The Tropic of Cancer lies at 23°26’ latitude North of the Equator– it is the northernmost point in which the sun is directly overhead at noon on the date of the summer solstice (June 21). The Tropic of Capricorn lies at 23°26’ latitude South of the Equator – it is the southernmost point in which the sun is directly overhead at noon on the date of the winter solstice (December 21). Arctic Circle - 66°33’ North Antarctic Circle - 66°33’South Why are degrees of the latitudes not perfectly constant? Is the earth a perfect sphere? Equatorial radius = 6378.16 kilometers. Polar radius = 6356.78 kilometers, so the difference in circumference is 71.1 kilometers.
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Unformatted text preview: It is not a perfect sphere; technically it is classified as an oblate spheroid or oblate ellipsoid (a sphere flattened at the poles.) Axial Tilt ( obliquity of the ecliptic) Axial tilt is the angle between the planets rotational axis and the normal of the plane of orbit. Today the Earth's axial tilt is about 23.5 degrees, which largely accounts for our seasons. Because of the periodic variations of this angle the severity of the Earth's seasons changes. With less axial tilt the Sun's solar radiation is more evenly distributed between winter and summer. However, less tilt also increases the difference in radiation receipts between the equatorial and polar regions. http://www.homepage.montana.edu/~geol445/hyperglac/time1/milankov.htm...
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Earth Latitudes - It is not a perfect sphere technically it...

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