Up and down legs

Light 06

Estimate

Two cities are 500 km apart. Fiber runs 1.2 times the distance: about 2.94 ms one way. The space path goes up 550 km, over one laser link of about 500 km, and down 550 km. Each of the 2 satellites adds 50 µs. How many ms does the space path take one way?

1 µs10 µs100 µs1 ms10 ms100 ms1 s

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