Astronomy Topic 3, Part 1

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Across
  1. 2. The north star in 26,000 years
  2. 3. The Greek who calculated distance and diameter also introduced this model first
  3. 7. The type of tide when the Moon is at a right angle to the Earth and Sun.
  4. 8. He made calculations of distances and diameters of Earth, Sun and Moon
  5. 10. The current north star
  6. 12. The moon takes up the same angular size as this body part
  7. 13. The type of tide when Earth-Sun-Moon are in a line
  8. 14. A relationship where one values doubles the other quarters (e.g. distance, force of gravity)
  9. 15. The Earth is flatter at the...
Down
  1. 1. The number of tides a day
  2. 2. The 26,000 year cycle of the Earth's wobble
  3. 4. He made the first calculation for the circumference of the Earth
  4. 5. The same side of the Moon is always seen because it is...
  5. 6. Edmund Halley used similar methods to the Greeks to calculate the distance to this inferior planet
  6. 9. Gravitational force from the moon (and partly the sun) causes this on the Earth
  7. 11. The Moon and Sun take up the same angular size of the sky because the sun is a greater