Position, Motion, Ecliptic and Parsec

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Across
  1. 3. An imaginary sphere surrounding Earth that is used to map the positions of stars and planets in the sky.
  2. 5. The Archer.
  3. 7. The apparent path of the Sun across the celestial sphere over the course of a year, which is also the plane of Earth's orbit.
  4. 10. The Sea Goat or Mountain Goat.
  5. 12. The Ram.
  6. 14. A band of the sky that extends on either side of the ecliptic, containing the 12 traditional zodiac constellations.
  7. 16. The Scales.
  8. 17. The Bull.
  9. 18. The Twins.
  10. 20. A unit of angular measurement that is 1/3600th of one degree.
Down
  1. 1. The Water-bearer.
  2. 2. The star, also known as Polaris, that appears to stay in a fixed position directly above Earth's North Pole, making it a key navigation tool.
  3. 4. The apparent change in an object's position caused by a change in the observer's viewing location. Astronomers use this to measure the distance to stars.
  4. 6. The point in the sky that is directly overhead from an observer's perspective.
  5. 8. The Crab.
  6. 9. The Scorpion.
  7. 10. Patterns of stars in the night sky, often named after animals, objects, or mythological figures.
  8. 11. The Fish.
  9. 13. The Maiden.
  10. 15. A unit of astronomical distance equal to about 3.26 light-years, derived from the measurement of parallax.
  11. 19. The Lion.