Lecture 5 -- Sun, Earth, & Moon
Dr. Henry Throop / University of Colorado
ASTR 1110
Friday, 9-Jun-2000

Announcements
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HW #1 -- various q's about the format, but generally look good.
HW #2 -- original plan to give out Friday, due Tuesday
          Will give out Monday, due Wednesday
	  Will cover history, kepler's laws, motions of sky

Planetarium show
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Point out directions
Sun & Moon locations
Blue sky
Sunset
Stars coming out
Light pollution: blow 'em out

  Different color stars
  Different brightness stars
  Stars move in fixed patterns, cartwheeling thru sky

  Intro to planetarium: Zeiss Mark V
  Two light bulbs, with holes punched in copper plates, like a colander for spaghetti

  Allows us to go to any time, any place on Earth
  No computers -- all totally analog

  Supernova!

Vocabulary:

  NCP
  SCP
  Zenith
  `declination' = n-s amount
  `altitude' = 
  Meridian: line going n-s thru zenith.  all stars cross meridian, when they're `most overhead'
  q: does sun get exactly overhead at all?

Tour of constellations up now!

  Scorpio
  Saggitarius
  Aquila
  Summer triangle!
    Lyra / Vega (Cosmos / Jodi Foster)
    Aquila / Altair
    Cygnus / Deneb

  Bootes / Arcturus

  Big dipper + little dipper
  Cassieopiea

  Delphinus

  Milky way!

Look at circumpolar constellations: big dipper
North star: is there an E/W star?  S star?

Right now: what planets are in sky?
A: not much.  Turn off the sun
Q: People often predict horrible things.  'Doomsday 2000', etc --
alignment of planets will cause massive earthquakes, etc. on earth from
all the gravity pulling.  But, does it _feel_ like less gravity?

'We can speed up planetarium -- so each year takes about 30 seconds.
This is about a million times faster than in reality!'

Retrograde/Prograde thing: follow Jupiter, and other planets too.
Watch their dance.

Go to north pole
Polaris is the star always right over the north pole.

Go to Equator: all stars rise, set -> telescopes built here

Southern hemisphere.
Q: do stars rise from E or W?

Seasons: count # of sec for Sun up during summer (now), winter.  Also
higher.

'These are all the motions that Ptolemy tried to explain, and that 
Copernicus tried to, and that finally Kepler did successfully.'

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Moon lab
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Look at moon phases
Give out worksheet from 1010

  Solar/Lunar eclipses
  Full/New moon
  Moon doesn't glow!  Direction of crescent tells you where the sun is!

Seasons lab
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Same

VG's:
  Pictures of moon phases, uranus phases, etc.
  Problems from textbook p. 70, n. 6: green = yes, red = no
  Is earth round from last time
  Color cards