GEO 121 10th Edition Lecture 14 Outline of Last Lecture I Tropic Cone II Analemma III Solar Radiation IV Atmospheric Moisture V Absolute Moisture VI Relative Humidity VII Equilibrium VIII Chapter Highlights Outline of Current Lecture IX Earth as a Planet a Mechanics b Solstices and Equinoxes Current Lecture 1 Earth as a Planet a Mechanics i Rotation 1 A circular movement of an object around a center or point of rotation A three dimensional object always rotates around an imaginary line called a rotation axis ii Revolution 1 revolution one full turn one full spin instance of revolving or spinning set order in which events take place ii Inclination 1 The magnetic field around Earth causes not only a compass needle to point north but also to tip downward in a straightline direction to north ii Parallelism 1 As Earth rotates around the sun the planetary axis remains parallel to all its former positions b Solstices and Equinoxes i Summer Solstice June 21 23 5 degrees N These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute ii iii iv Winter Solstice December 21 23 5 degrees S Fall Equinox September 23 180 degrees E W Spring Equinox March 20 180 degrees E W
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