GEO 155 1st Edition Lecture 3 Outline of Last Lecture I Composition and Structure of the Atmosphere Outline of Current Lecture II Earth s Motion III Influence on Energy Current Lecture Earth Sun Relationship Earth s Motion Rotates every 24 hours Tilted on its axis 23 5 degrees Revolves around the sun every 365 25 days Not in a perfect circle Not the cause of seasons o Remains in the Plane of the Ecliptic tilts 23 5 degrees from the plane o Axis remain parallel to itself as it revolves and rotates Influence on Energy 1 Overhead position of sun solar altitude a Beam spreading amount of energy per unit area higher in sky more amount spread 2 Day length more energy as you get higher and the longer the sun is out I June 20 21 Summer Solstice the North Pole is leaning toward the sun The Earth on its axial tilt leans 23 5 degrees toward the sun and the sun is position 23 5 degrees north of the equator at the Tropic of Cancer North Pole receives 24 hours of sunlight Arctic Circle receives 12 24 hours of sunlight Tropic of Cancer receives 12 24 hours of sunlight 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 Equator receives 12 hours of sunlight Tropic of Capricorn receives 0 12 hours of sunlight Antarctic Circle receives 0 12 hours of sunlight South Pole receives 0 hours of sunlight December 21 22 Winter Solstice the South Pole is tilted toward the sun thus the Southern Hemisphere is drowned in sunlight because the sun is position 23 5 degrees south of the equator at the Tropic of Capricorn III North Pole receives 0 hours of sunlight Arctic Circle receives 0 12 hours of sunlight Tropic of Cancer receives 0 12 hours of sunlight Equator receives 12 hours of sunlight Tropic of Capricorn receives 12 24 hours of sunlight Antarctic Circle receives 12 24 hours of sunlight South Pole receives 24 hours of sunlight Equinox 12 hours of daylight 12 hours without light a March 20 21 Vernal or Spring b September 22 23 Autumnal or Fall Winter days are shorter sun is lower less energy Summer days are longer sun is higher more energy o Seasonal differences increase with latitude in both directions from the equator Latitudinal differences are greater in the winter
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