New_Ch03_Season-temp_107 - Ch 3 Seasonal and Daily...

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Ch. 3 Seasonal and Daily Temperatures 3.1 Why Does Earth have Seasons? 3.2 Daily Temperature Variations 3.3 Measurements of Temperature
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Earth’s Revolving Earth revolves around the Sun at thousands of km per hour Distance from sun does not determine the seasons!!
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Earth’s Rotation Earth rotates counterclockwise about its axis at hundreds of km per hour. Earth’s axis is tilted at 23.5 degrees.
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3.1 Why Does Earth Have Seasons? Seasons are regulated by the amount of solar energy received at the surface , determined by: How slant is light striking the surface How long is the sun shine Also under low angle, sunlight spreads out, passes through more atmosphere, is scattered and absorbed more
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Solar Angle Effect on Light Intensity
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Why Does Earth Have Seasons?-cont’d Why are summer days longer than winter days? Why is the noon sun higher in the sky in summer? Due to the 23.5° tilt of Earth’s axis with respect to the normal of orbital plane. Axis is always pointing in the same direction NH is tilted toward sun in summer and away from sun in winter If Earth were not tilted – noonday sun always overhead at Equator (nowhere else) 12 hrs daylight, 12 hrs darkness at every latitude, every day
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Graphical Summary of Seasons F:\107\Mdia\Active_Figgurs/44_Reaso ns_for_Seasons.html (click February first, then other seasons) F:\107\Media\Animations\Sea sons.mov
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Solstice is when sun is at its greatest distance from equator. Summer solstice (June 21) – longest day in N.H.; sun is at 23.5 o N; sun does not set north of 66.5 o N.
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