Astronomy Ch 3 Vocab

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Across
  1. 2. Occurs when moon passes through Earth's shadow and goes dark.
  2. 5. A thin layer of bright gas on the sun.
  3. 8. Used to find the angular diameter of any object.
  4. 10. How long it takes the moon to circle the sky once and return to the same position among the stars.
  5. 11. The sun's outer atmosphere.
  6. 12. A complete cycle of lunar phases takes 29.53 days.
  7. 14. The path swept out by the umbral spot.
  8. 15. Occurs when the moon moves between Earth and the sun.
  9. 18. The region of total shadow during an eclipse.
  10. 19. The bright surface of the sun.
  11. 21. When a solar eclipse occurs when the moon's angular diameter is too small, and you see a solar eclipse with a ring of light visible around the disk of the moon.
  12. 22. Eruptions on the solar surface.
  13. 24. When the moon moves between Earth and the sun, and from your location the moon only covers part of the sun.
  14. 25. The region of partial shadow during an eclipse.
  15. 26. The period when the moon is completely in shadow.
Down
  1. 1. If the moon's orbit carries the full moon too far north or south of the umbra and the moon may only partially enter the umbra.
  2. 3. This points toward the sun during an eclipse season.
  3. 4. If the moon's orbit carries it far enough north or south of the umbra, and the moon may pass through only the penumbra and never reach the umbra.
  4. 6. A period during which the sun is close to a node in the moon's orbit, and this is the only period when an eclipse can occur.
  5. 7. After one of these, which is 18 years and 11 1/3 days, the pattern of eclipses repeats.
  6. 9. Just as totality begins or ends, a small part of the photosphere can peek out from behind the moon, and forms a silvery ring of light with a brilliant spot of photosphere gleaming like a diamond.
  7. 13. When the moon passes through the umbra and no part of the moon remains outside the umbra in partial sunlight of the penumbra.
  8. 16. An ________ _________ is 346.6 days long.
  9. 17. When the moon is at its closest point to Earth.
  10. 20. When the moon moves between Earth and the sun and the moon covers the disk of the sun completely.
  11. 21. When the moon is at its most distant point from Earth.
  12. 23. Each month, the moon crosses the ecliptic at two points called ___________.