ASTR1002 Mystery Object Tute

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ASTR1002 Mystery Object Tute
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Patterns in the Night Sky

• Imagine, once again, that you live in Mog, where
  the clouds recently cleared (for the first time
  in history) giving you a view of the sky for the
  first time.
• You now know that Mog is a sphere, spinning on
  its axis and orbiting its Sun.
• You know that stars appear to circle the
  celestial pole roughly once a day (actually
  travelling 361 degrees around in a 24 hour
  period).
• But now, youve seen something rather strange in
  the twilight sky. Every two weeks, during the
  last month or so, youve been out just after
  sunset, looking towards where the Sun has just
  set.
• You live on the equator.

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Six weeks ago
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Four weeks ago
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Two weeks ago
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Tonight
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Explain what you see!

• Your job, working in groups, is to explain what
  you see.
• You should thing about the pictures and what they
  mean for a bit.