Who set the first clock?

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Across
  1. 2. One of the four main directions; if you are facing north, it is to the left
  2. 4. One of the four main directions; when you face north, west is to the left, and east is to the right
  3. 5. One of the four main directions; if you are facing north, it is to the right
Down
  1. 1. One of the four main directions; if you are facing north, it is the direction behind you
  2. 3. A tool that tells time by using the changing directions of shadows caused by the sun’s movement across the sky