ABE-TSM436_Lecture3 - Solar Time and Solar Angle How much...

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1/27/2010 1 Solar Time and Solar Angle Solar Time and Solar Angle How much solar radiation available in the west wall of Agricultural Engineering Building at 3pm, March 30?
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1/27/2010 2 Topics of the Day * Earth’s motion about the sun * Solar time * Solar angle
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1/27/2010 3 Factors Affecting Solar Radiation ¾ The location of the sun in the sky ¾ The clearness of the atmosphere ¾ The location of the plane ¾ The orientation of the plane What are the major factors in the effect of solar radiation on a plane?
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1/27/2010 4 Earth’s tilt and rotation about sun (McQuiston et al., 2005)
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1/27/2010 5 Facts about Earth’s motion ¾ Earth’s motion: elliptical orbit ¾ Elliptical plane ¾ Jan 4: closest point 98.3% of 92.9x10 6 miles ¾ July 5: farthest point 101.7% of 92.9x10 6 miles ¾ Summer solstice: N pole (daylight), S pole (darkness) ¾ Winter solstice: S pole (daylight), N pole (darkness) ¾ Vernal (3/21) or Autumnal (9/22 or 23) equinox: 12 hrs daylight, 12 hrs darkness.
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1/27/2010 6
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ABE-TSM436_Lecture3 - Solar Time and Solar Angle How much...

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