AST 307 · Introductory Astronomy
Fall 2003


Chapter 1  Aug. 27,29

  1. Describe the concepts of the celestial sphere, celestial poles, and celestial equator.

  2. Use the concept of the celestial sphere to describe the apparent motions of stars at different locations on the celestial sphere during a night.

  3. Describe how the orbital motion of the Earth makes the Sun appear to move around the celestial sphere during a year.

  4. Describe how the Sun appears to move across the sky during a day, and how its apparent motion changes during a year.

  5. Explain why the length of the solar day differs from the length of the sidereal day, and why there is one more sidereal than solar day in a year.

  6. Describe how the orbital motion of the Moon around the Earth causes its appearance (phase) to change during a month.

  7. Be able to figure out when the Moon rises and sets when it is in different phases.

  8. Understand why solar and lunar eclipses occur, at what lunar phases they occur, and why they don't occur every month.

  9. What is the arrangement of the Sun, Earth, and Mars when Mars is closest to Earth?

  10. When and in what direction should you look to see Mars at this time?

  11. Why does the Earth sometimes come closer to Mars at closest approach than at other closest approaches?

27 August 2003
Astronomy Program · The University of Texas at Austin · Austin, Texas 78712
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