24.2 Sun and Seasons http://highered.mcgraw-hill.com/sites/007299181x/student_view0/chapter2/seasons_interactive.html.

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Presentation transcript:

24.2 Sun and Seasons http://highered.mcgraw-hill.com/sites/007299181x/student_view0/chapter2/seasons_interactive.html

Earth Motions 1. Earth moves in two major ways: Rotation: spinning of earth on its axis Revolution: earth orbits around the sun

What Causes Seasons? Tilt of the earth as it moves around the sun Earth is tilted by 23.5 degrees 2. As the earth orbits, different parts of the earth get direct and intense solar radiation

Seasons 3. Opposite in the N and S hemisphere 4. When N tilted to the sun (summer), S tilted away (winter) 5. If the earth was not tilted= no seasons

Seasons and Latitudes 1. Polar: Cold, don’t have 4 seasons (66.4 N or S to poles) 2. Temperate: 4 seasons (23.5-66.5 N or S) 3. Tropics: Warm all year, no seasons (23.5 N or S) Get intense rays all year long

Solstice: sun is directly overhead at latitude 23.5 N or S Equinox: neither hemisphere is tilted toward the sun, and the lengths of daylight and darkness are =

VERNAL EQUINOX : March 21 1st day of spring Days get longer and warmer Sun’s direct & intense rays fall on the EQUATOR (and move north throughout spring) (equal day and night @ equator) SUMMER SOLSTICE: June 21 1ST day of SUMMER Longest day of the year – Shortest night Sun’s direct & intense rays are over 23.5 N (Tropic of Cancer) AUTUMNAL EQUINOX: Sept 23 1st day of Fall Sun’s direct & intense rays fall on the EQUATOR Days get cooler and shorter WINTER SOLSTICE: Dec 21 1ST day of Winter Longest night – shortest day Sun’s direct & intense rays are over 23.5 S (Tropic of Capricorn)