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Observing Basics

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Ancient astronomers envisioned a great hollow sphere surrounding ... Found in the handle of the little dipper. Dist = 430 ly. Not a significantly bright star ... – PowerPoint PPT presentation

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Title: Observing Basics


1
Observing Basics
  • What is there to see in the night sky?

2
Stars
3
Planets
4
Sun
5
Satellites
6
Galaxies
7
Moon
8
The Celestial Sphere
  • Ancient astronomers envisioned a great hollow
    sphere surrounding the earth.
  • All the stars were attached to the sphere.
  • The sphere rotated once a day carrying all the
    stars, the moon, the sun, and the planets.

9
Celestial Sphere
10
  • The celestial sphere model is still used today.
  • Notice the celestial poles.
  • The suns path is known as the ecliptic.
  • Zenith is the point directly over head.

11
Stars and Planets
  • Stars Twinkle
  • Planets dont

Why is this?
12
General info on stars.
  • Most star names come from ancient Arabic
  • Siris the searing/scorching one
  • Capella little she-goat
  • Alderban follower of the Pleiades

13
Greek Letters
  • Like you know, Greek letters are used to
    designate the order of brightness.
  • Alpha the brightest star in the constellation.
    a
  • Beta second brightest, etc. ß

14
Polaris
  • The north star.
  • Found in the handle of the little dipper.
  • Dist 430 ly
  • Not a significantly bright star

15
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17
Constellations
  • Groupings of stars
  • Purpose Entertain, Tell Stories, Record History
  • Not real objectsDuh!
  • Must use imagination
  • 88 recognized constellations

18
Constellation stars may appear close to each
other, but they may actually be far away.
90
120
220
60
70
70
95
19
Asterism
  • Grouping of stars that is not a constellation.
  • What do you see?
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