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Exploring Seasons and Solar Energy Transfer

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  1. LEARNING GOALS • Investigation 3- Seasons and Sun • Enduring Understanding: • Seasons are related to the amount of solar energy transferred to Earth, and that amount of energy transferred is affected by latitude, tilt of Earth’s axis, revolution, and rotation. • Learning Goals: • I will graph monthly day-length data for a single location to look for a pattern. • I will use a globe and light bulb to model daily and seasonal variations in day length. • I will explain how the tilt of Earth’s axis and Earth’s revolution around the sun produces seasons. • I will discuss seasonal variation in day length as a consequence of axis tilt, rotation, and revolution. • I will use light sources and surfaces to model beam spreading. • I will explain how beam spreading reduces the intensity of solar radiation.

  2. Seasons and Sun

  3. Quick Write: 5 Minutes

  4. MOVIE:Reasons for the Seasons Video in the file under Seasons

  5. 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.

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

  7. SUNSHINE • How many hours of sunlight will we have today? • Sunrise= 5:49am • Sunset= 7:05pm • Calculate the hours and minutes. • Hint: Calculate the hours and minutes between sunrise and noon, then between noon and sunset, then add them together.

  8. SUNSHINE • Example: • Sunrise=6:24am • Sunset=6:44pm • 6:24-11:24= 5 hours • 11:24-12:00= 36 minutes • So 5 hours, 36 minutes • 12:00-6:00= 6 hours • 6:00-6:44= 44 minutes • So 6 hours, 44 minutes • Total= 12 hours, 20 minutes

  9. 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

  10. 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

  11. 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?

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

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