Astronomy Vocabulary

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Across
  1. 3. Type of tide, one high, one low per day
  2. 6. Point at which Earth is closest to the sun
  3. 8. The splitting of atoms
  4. 9. Unit of measurement (average distance between Earth and the Sun)
  5. 10. Point at which the Earth is farthest from the sun
  6. 11. Type of tide, two high, two low each day
Down
  1. 1. Length of time it takes to revolve or rotate once around a focal point
  2. 2. The center of mass of two or more objects orbiting each other
  3. 4. The rocking or swaying in the axis of rotation
  4. 5. Process by which plants convert sunlight, water, and carbon dioxide into glucose
  5. 7. The slow circular motion of the axis of the earth
  6. 8. Two atoms joining into one larger