ROYAL OBSERVATORY

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Across
  1. 2. Charles' cousin that was good at maths
  2. 7. Aligned with the meridian to observe the heavens
  3. 9. Length of the Star Chamber telescope
  4. 11. The Royal Society was given this in 1662
  5. 12. Sailors could calculate this using the sun and stars
  6. 13. Shape of the Star Chamber
  7. 15. Barrels of what were sold to raise money?
  8. 16. Site of the Royal Observatory
  9. 17. The problem that needed solving
Down
  1. 1. First Royal Astronomer
  2. 3. Louis XIV commissioned this in 1675
  3. 4. The number of degrees in one hour
  4. 5. 12 Men met here in November 1660 to listen to Wren
  5. 6. Introduced Le Sieur de St Pierre to Charles II
  6. 8. This planet's rings were debated
  7. 10. Designed the RO
  8. 14. The gatehouse of which tower was used for bricks?