Astronomy Crossword

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Across
  1. 2. / a megalithic monument on Salisbury Plain in Wiltshire, England
  2. 4. Motion / the direction opposite to the movement of something else
  3. 6. Equinox / vernal equinox
  4. 7. Solstice / the solstice that marks the onset of summer
  5. 8. / having Earth as the center instead of the Sun
  6. 9. / having the Sun as the center
  7. 11. Equinox / autumnal equinox
  8. 14. / a fairly bright star located within one degree of the north celestial pole
Down
  1. 1. Unit / the distance from the center of the Earth to the center of the Sun
  2. 3. Solstice / the solstice that marks the onset of winter
  3. 5. / a horizontal angle or direction of a compass bearing
  4. 10. / the action of a planet turning on its axis
  5. 12. / an imaginary line which a planet rotates on
  6. 13. Meridian / the planets zero of longitude