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Lecture 2: Spaceship Earth

Lecture 2: Spaceship Earth.

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Lecture 2: Spaceship Earth

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  1. Lecture 2: Spaceship Earth Man is…related inextricably to all reality, known and unknowable…plankton, a shimmering phosphorescence on the sea and the spinning planets and an expanding universe, all bound together by the elastic string of time. It is advisable to look from the tide pool to the stars and then back to the tide pool again. -- John Steinbeck

  2. Earth’s Rotation

  3. The Earth’s Orbit

  4. The Reason for Seasons Spring Equinox Summer Solstice Winter Solstice Fall Equinox

  5. Summer Solstice at the Arctic Circle

  6. Precession of the Earth’s Axis

  7. Phases of the Moon

  8. Eclipses • Solar eclipse: occurs when the Moon’s shadow falls on the Earth • occurs only at new moon. • Lunar eclipse: occurs when the Moon passes through the Earth’s shadow • occurs only at full moon.

  9. Solar Eclipses Total path Partial path Annular

  10. A total eclipse of the Sun

  11. Fixed Stars and Wandering Planets

  12. The Sun’s Motion Through the Zodiac

  13. The Mystery of Retrograde Motion Jupiter, shown at one month intervals

  14. Explaining Retrograde Motion

  15. Stellar Parallax

  16. Stellar Motions in the Solar Neighborhood

  17. Rotation in the Galaxy

  18. Hubble’s Law

  19. The Expanding Universe

  20. Astronomical Distance Units 1 parsec = 3.26 light years

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