Chapter 2 Vocabulary ~ The Sky

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