Teaching Sample: The Reasons for the Seasons

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Teaching Sample The Reasons for the Seasons

• 2003 August 04
• Central Arizona College
• Robert L. Marcialis, Ph.D.
• 5550 N. Maria Drive
• Tucson, AZ 85704
• [phone]
• umpire_at_LPL.arizona.edu

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Discussion Why do we have seasons?
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Question What are the properties of Earths
seasons?

• Suns size stays constant throughout year (about
  1/2º)
• Seasons are reversed in Northern, Southern
  hemispheres
• Length of daytime, nighttime varies with season
• Midnight sun and days without sunrise near
  poles
• Very moderate seasons near the equator constant
  throughout year

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To understand true cause, we need todefine

• ecliptic
• celestial equator
• obliquity
• equinox, solstice

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For these lecture notes more, see the course
web pagehttp//www.LPL.arizona.edu/umpire/CAC/
demo.html
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