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