Winter

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Across
  1. 4. (N) A circular diagram representing the 12 constellations
  2. 5. (N) Bands of light caused by charged solar particles
  3. 8. (N) When the sun crosses the plane of the Earth’s equator
  4. 9. (N) A configuration of stars as seen from Earth
  5. 11. (N) The point below the observer directly opposite the zenith
  6. 12. (adj) Relating to or inhabiting a divine heaven
Down
  1. 1. (N) When the sun is at its greatest distance from the equator
  2. 2. (adj) Characteristic of, or relating to, winter
  3. 3. (adj) Like, or relating to, twilight; dim
  4. 6. (N) Half of a round, three-dimensional shape
  5. 7. (N) The highest point of something
  6. 10. (adj) Belonging to or active during the night