GEO 121 1st Edition Lecture 8 Outline of Last Lecture I Review of Scales 1 Types of Scales 2 Common Scales II Aerial Photographs I II III IV Outline of Current Lecture Why Should We Care About The Sun s Position Influences on Radiation at the Earth s Surface Tropics of Cancer and Capricorn Rotation and Revolution of Earth Current Lecture Why should we care about the sun s position at noon Maximum impact of solar radiation o At noon the sun strikes the Earth at 90 degrees o Normally it strikes the Earth at a lower angle Influences on Radiation at the Earth s Surface Rotation Revolution Parallelism Incline Tropics of Cancer and Capricorn Cancer 23 5 degrees N o June 21 Summer Solstice Capricorn 23 5 degrees S o December 21 Winter Solstice The highest and lowest positions of the sun Rotation and Revolution of Earth Rotation of the Earth o Once every 24 hours o West to East creates day and night Revolution of the Earth o Position of the Earth around the Sun o Once every 365 1 4 days The extra quarter day is what makes our leap years every 4 years
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