Atomic clocks

Leap seconds are introduced because, according to our reference standard — the atomic clock — the earth’s rotation is slowing down.

But surely it’s all relative? The earth’s rotation could be staying the same, and the oscillation of caesium speeding up, for reasons we don’t understand. Is it actually possible to tell the difference? Is atomic oscillation calibrated against something other than other atomic oscillations?

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1 Comment

  1. I don’t know about atomic clocks but
    the earth definitely is slowing down
    because of tidal drag with the moon
    with the energy of the earths lost rotation
    pushing the moon into a higher orbit.

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