One Phrase, One Word

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Across
  1. 4. astronomical almanacs
  2. 8. scientific study of celestial objects
  3. 9. study of position and movements of celestial bodies
  4. 12. parallels of latitude
  5. 14. April 8, 2020, 10:35 am PST
  6. 17. pedestal of a sundial
  7. 18. angle between the celestial equator and the ecliptic
  8. 19. imaginary belt around the heavens
Down
  1. 1. a moment in time
  2. 2. north polar distance
  3. 3. 206,265 astronomical units
  4. 5. sun stands still
  5. 6. diurnal rotation of the Earth on its axis
  6. 7. regions of the sky
  7. 10. wobble motion
  8. 11. star crosses the local meridian
  9. 13. two extreme points in the orbit of a planetary body about its primary body
  10. 15. point directly beneath the observer
  11. 16. equal night
  12. 17. pattern of stars