Motion and time

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Across
  1. 1. Distance travelled in one unit of time. (5)
  2. 3. Shortest distance between two points. (12)
  3. 4. Motion in a straight line. (11)
  4. 5. Ancient device that measures time using the Sun. (7)
Down
  1. 1. used to measure short time intervals. (9)
  2. 2. motion that repeats at regular intervals. (8)