GPHY 102 Lecture Notes - Lecture 3: Equinox, Mercator Projection, Decimal Degrees

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GPHY 102 Full Course Notes
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GPHY 102 Full Course Notes
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Exercise is on onq bring printed copy, pencil, ruler, calculator and textbook. Earth is an oblate ellipsoid; not a perfect sphere, it bulges slightly at the equator. Direction of rotation: earth rotates counter clockwise (when looking down from the north pole, when viewed from space it rotates west to east (important for sunrise/sunset, rotates on its axis once a day (24 hours) Provides day as a measure of time. Environmental effects of rotation: diurnal rhythm of energy affects air temperature and humidity and air motion, coriolis effect. Global winds and ocean currents: tides. Moon and sun gravitational pull on oceans. Geographic grid: reference system for location on earth"s surface, divides earth into grids. Parallel with each other, do not converge. Great circles: created when a plane passing through center of earth divides it in two halves, meridians and half of a great circle.

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