Lecture 2 - Problem Solving, The Night Sky

Seeds: Chapter 2

1. Hints on Homework Problems
   • Chapter 1 problems (worked in class)
   • Write down where you got numbers from
   • Write down units
   • Write out all steps in calculation
   • Check units of answer by dimensional analysis
   • Does the order of magnitude of the answer make sense?
   • Don't need to keep extraneous digits of precision
   • Use scientific notation
   • Review of proportions
   • Review of logarithms
2. The Sky as We See It
   • The Solar Neighborhood as Box'O'Stars
   • City Sky - Rural Sky - Desert Sky (Have you seen the Milky Way?)
   • Planetaria?
   • 88 Constellations (48 Ancient)
   • Asterisms (like the Big Dipper)
   • Groupings are only apparent - different distances
3. Daily Problem(s)
   • Chapter 2 - Problem 2 (p.29)
   • Chapter 2 - Problem 4 (p.29)
   • I will work these at the beginning of class Friday
   • I will assign homework problems on Friday (due 2 weeks)

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