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LEARNING GOALS

LEARNING GOALS. I will discuss seasonal variation in day length as a consequence of axis tilt, rotation, and revolution. Seasons and Sun. MOVIE: Reasons for the Seasons. SUNSHINE. I’ve heard it said that December 21 is the shortest day of the year. Why would someone say that?

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LEARNING GOALS

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  1. LEARNING GOALS • I will discuss seasonal variation in day length as a consequence of axis tilt, rotation, and revolution.

  2. Seasons and Sun

  3. MOVIE:Reasons for the Seasons

  4. SUNSHINE • I’ve heard it said that December 21 is the shortest day of the year. • Why would someone say that? • Do we have fewer than 24 hours on December 21? • We get fewer hours of sunlight in winter, more hours of sunlight in summer, but the sum of light and dark hours always equals 24.

  5. SUNSHINE • If it is true that there is a shortest day, is there also a longest day of the year? • June 21

  6. SUNSHINE • How many hours of sunlight will we have today? • Sunrise= 7:15am • Sunset= 6:12pm • Calculate the hours and minutes. • Hint: Calculate the hours and minutes between sunrise and noon, then between noon and sunset, then add them together.

  7. SUNSHINE • Example: • Sunrise=7:15am • Sunset=6:12pm • 7:15-11:15= 4 hours • 11:15-12:00= 45 minutes • So 4 hours,45 minutes • 12:00-6:00= 6 hours • 6:00-6:12= 12 minutes • So 6 hours, 12 minutes • Total= 10 hours, 57 minutes

  8. GRAPH QUESTIONS • What does the graph reveal about the amount of daylight over a year in Berkley? • Days get longer from January to June, shorter from June to December • When do people in Berkley have their longest day? Shortest? • Longest= June, Shortest= December • When do people in Berkley have about 12 hours of daylight? • March and September

  9. GRAPH QUESTIONS • How many hours of daylight do people in Berkley have on their longest day? On their shortest day? • Longest= 14+, Shortest= 9+ • In what season do people in Berkley have their longest day? Their shortest day? • Longest= Summer, Shortest= Winter

  10. GLOBAL DAYLIGHT • When one location on Earth has 14 hours of daylight, is all the rest of the world having 14 hours of daylight as well? • Is the longest day of the year the same length all over the world? • Is the longest day of the year the same day all over the world? • Are the longest days always in the summer? Are the shortest days always in the winter?

  11. READING:“Wendy and Her Worldwide Weather Watchers”page 12

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