Homework question for Class 03
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1. Question
- Name three aspects of the sun’s motion that are associated with the changing seasons. Explain how they relate to each other and to the observed seasonal changes. Max. word count: 500
- In class, we talked about the fact that the sun drifts slowly eastward through the Zodiac each year, so that in one year it gets lapped by the stars—i.e., the stars make one extra revolution per year compared to the sun.
But we measure time by the motion of the sun. Our 24-hour day is defined as the length of time it takes the sun to make one complete revolution around the sky. But if the stars revolve slightly faster than the sun, that means they take less than 24 hours to make one complete revolution. So we can define a “star day”—or “sidereal day” (sidus being Latin for “star”) as the length of time it takes the stars to make one complete revolution around the sky.
How long, in hours and minutes, is a sidereal day (to the nearest minute)? (Be sure to show how you calculated that time period.)
Deadline: Sunday, Oct. 16, end of day, your local time.
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