Chapter 2 Vocabulary ~ The Sky

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Across
  1. 4. Direction directly below an observer on Earth
  2. 7. Eye-level line of sight swept all around the sky, that would define the astronomical horizon, opposite of West
  3. 9. The generation of a physical, conceptual, or mathematical representation of a real phenomenon that is difficult to observe directly
  4. 10. First Introduce by Hipparchus
  5. 12. The southern imaginary point in the sky where the Earth's axis of rotation intersects the celestial sphere
  6. 13. The northern imaginary point in the sky where the Earth's axis of rotation intersects the celestial sphere
  7. 16. Well-defined regions on the sky, irrespective of the presence or absence of bright stars in those regions
  8. 17. Direction directly above an observer on Earth
  9. 18. A star pattern that is not officially recognized by the international scientific community as a constellation
Down
  1. 1. Eye-level line of sight swept all around the sky, that would define the astronomical horizon, opposite of East
  2. 2. A unit of angular measurement equal to one-sixtieth of one degree
  3. 3. The brightness of an object as seen from our planet
  4. 5. A unit of measurement that amounts to one sixtieth of an arc minute
  5. 6. The point straight overhead on the celestial sphere for any observer is called the zenith and is always 90 degrees from the horizon
  6. 8. Distance of a celestial body north or to the south of the celestial equator
  7. 11. An imaginary sphere of arbitrarily large radius, concentric with Earth
  8. 14. The point straight underneath on the celestial sphere for any observer is called the zenith and is always 90 degrees from the horizon
  9. 15. Boundary where the sky seems to meet the ground or sea