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Constellations

Constellations. Celestial Sphere. Our Point of View. Angular Size and Distance. Relevant Geography. Earth’s Rotation. 23 hours and 56 minutes relative to background stars (sidereal period) Spin axis of Earth defines points on the celestial sphere (using north and south poles)

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Constellations

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  1. Constellations

  2. Celestial Sphere

  3. Our Point of View

  4. Angular Size and Distance

  5. Relevant Geography

  6. Earth’s Rotation • 23 hours and 56 minutes relative to background stars (sidereal period) • Spin axis of Earth defines points on the celestial sphere (using north and south poles) • North Celestial Pole • South Celestial Pole • Celestial Equator • Sky appears to rotate east to west about the celestial poles because Earth rotates west to east.

  7. Celestial Sphere

  8. Motion on the Sky

  9. Motion Depends on Declination

  10. Circumpolar Constellations • Circumpolar constellations never set. • Circumpolar constellations change with latitude… sky changes with latitude

  11. Tilt of Spin Axis

  12. The Ecliptic

  13. Ecliptic on the Celestial Sphere

  14. The Equinoxes and Solstices • Tilt of the spin axis is related to the seasons • Effect of tilt on climate is not instantaneous

  15. Precession of the Earth’s Axis

  16. North Celestial Pole Changes

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