Astronomy Crossword puzzle

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Across
  1. 8. Outer lighter part of a shadow during an eclipse
  2. 9. Occurs when day and night are the same length
  3. 10. The path the sun traces in the celestial sphere - the plane where Earth orbits the sun
  4. 11. Small star cluster within a constellation
  5. 12. Time it takes for one cycle of phases (New Moon to New Moon)
  6. 13. North Star
  7. 16. Imaginary sphere surrounding the Earth with stars fixed on its surface
  8. 17. The longest and shortest days of the year
  9. 18. Distance that is angled from the North or South horizon
Down
  1. 1. Brightest star in the constellation Boötes
  2. 2. Distance that is angular north or south of the celestial sphere
  3. 3. Constellations through which the sun moves as it travels around the ecliptic (12)
  4. 4. Group of stars forming a pattern in the night sky
  5. 5. Inner, dark part of a shadow during an eclipse
  6. 6. Brightest star in the constellation Leo
  7. 7. Distance that is angular which is eastward along the celestial equator
  8. 12. Time it takes for one complete orbit around the Earth
  9. 14. Height angle above the horizon
  10. 15. Brightest star in the constellation Virgo
  11. 18. Figure eight shape which represents the sun’s position in the sky