Friday, September 6, 2013
Announcements: Friday ID scans...;
What to do about any Top Hat issues.
Today's Topics:
• Review questions from Wednesday. (Q)
Orbit of the Moon and Eclipses
• The size we see varies, for full moons too.
• The side we see does not! (Rotation Q).
• The period is 27.3 days (Why not 29.5?)
• What are lunar eclipses? Total vs partial.
• What are solar eclipses? Total, annular and partial; What can make it annular? (Also...)
• In what phase must the Moon be for an eclipse to happen? (Q) Can we predict one?
Motion of the Planets
• The mysterious retrograde motion.
• Summary of the main motions in the sky.
• Main question: What are the real motions?
Assignment: Go over today's summary. Suggested reading: Finish Chapter 2. Next time we should begin talking about the history of astronomy (Chapter 3).
Spaceweather; APOD; Heavens-Above; Clear Sky Clock; Space Calendar; Sky & Telescope Sky at a Glance
