Ad Astra Per Aspera!

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Across
  1. 1. Latin for night, derivative: nocturnal
  2. 4. Latin for mist/fog/cloud, derivative: nebulous
  3. 7. the hunter
  4. 9. Latin for lightning, derivative: fulminate
  5. 10. Latin for moon, derivative: lunatic
  6. 12. Latin for evening star (a.k.a. Venus), derivative: vespers
  7. 13. Latin for upper air/clear sky, derivative: ethereal
  8. 14. Latin for bear (Major or Minor)
  9. 15. Latin for comet, derivative: comet
  10. 17. Latin for (rain)bow, derivative: archer
  11. 18. Latin for star, derivative: stellar
Down
  1. 1. Latin for cloud, derivative: nebula
  2. 2. Latin for sun, derivative: solar
  3. 3. Latin for sky, derivative: celestial
  4. 5. Latin for dawn, derivative: Aurora Borealis
  5. 6. Latin for wind, derivative: ventilation
  6. 8. Latin for rain, derivative: pluviometer
  7. 11. Latin for meteor, derivative: meteoric
  8. 16. Latin for eagle, derivative: aquiline
  9. 18. Latin for constellation, derivate: sidereal