3 - ( The north star is near the north celestial pole)...

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Sirus = 8 light years Creating a Model -whenever we try to understand a new concept, its useful to create a model. A model is a representation of the real world which is easy to visualize. -Model can be created using paper, computers or our mind. -A model can be an accurate miniature version or a useful simplification. -our model for space is called the celestial sphere Celestial Sphere -The celestial sphere is an imaginary sphere around the earth. -we can point out the location of a star or planet on this sphere. (in this model, we ignore they are far away) In addition to the north, south, east and west we have: Zenith: The highest point directly above Horizon: circle between the sky and earth. Reading Finish chapter 1 this week. Three points on the celestial sphere: North celestial pole : point in space just above the North Pole of Earth
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Unformatted text preview: ( The north star is near the north celestial pole) Celestial Equator: a circle in space above the equator South Celestial Pole: point in space just above the South Pole of earth. Viewing the sky from Earth-Our view of the sky depends on where we are on Earth.-People in the southern hemisphere cannot see the North Star.-people who live on earths equator can see stars both north and south of the celestial equator.-the motions of stars also depend on your location Zenith: north celestial pole (if we lived at the North Pole) 90 degrees latitude Stars dont rise or set they just move across (If we lived in Alaska) 60 degrees latitude North celestial star will appear (San Francisco) 30 degrees latitude ZENITH ALWAYS FACING UP (If we lived at the Equator) latitude 0 degrees The north star will be at the horizon...
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This note was uploaded on 09/24/2011 for the course SCI 115 taught by Professor Mccarthy during the Spring '11 term at S.F. State.

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3 - ( The north star is near the north celestial pole)...

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