PHY 121 Module 2 Crossword

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Across
  1. 3. Earth's orbital plane around the sun.
  2. 4. An area where a group of visible stars forms a perceived pattern or outline, often an animal or mythological figure.
  3. 7. The border between the Earth and sky as you look forward in the distance.
  4. 9. Slow changes in the orientation of the rotational axis of a celestial body, similar to the changes in the rotational direction of a spinning top.
  5. 12. A pattern of stars in the sky, not necessarily related to a constellation.
  6. 13. The number of phases of the moon
Down
  1. 1. An imaginary Earth-centered sphere projecting into space, used to describe the position of celestial bodies.
  2. 2. The point right above your head directly opposite the ground below you.
  3. 5. The constellation that includes a three-star "belt."
  4. 6. The length of time it takes the Earth to orbit completely around the Sun.
  5. 8. An imaginary arc that extends from the North Pole to the South Pole and separates the Eastern Hemisphere from the Western Hemisphere, from your point of view. It passes through the zenith right above you.
  6. 10. The season in the Northern hemisphere when the North Pole is tilted away from the Sun.
  7. 11. The fraction of the moon we see all the time.