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Teaching Sample: The Reasons for the Seasons

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 (520) 293-7399 umpire@LPL.arizona.edu. Discussion: Why do we have seasons?. Question: What are the “properties” of Earth’s seasons?.

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Teaching Sample: The Reasons for the Seasons

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  1. 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 (520) 293-7399 umpire@LPL.arizona.edu

  2. Discussion: Why do we have seasons?

  3. Question: What are the “properties” of Earth’s seasons? • Sun’s 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

  4. To understand true cause, we need todefine: ecliptic celestial equator obliquity equinox, solstice

  5. For these lecture notes & more, see the course web page:http://www.LPL.arizona.edu/~umpire/CAC/demo.html

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