Breguet understood that in order to reduce such errors, he would need to install the entire escapement within a mobile carriage that would perform a complete rotation, generally in one, four or six minutes.

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"If the sudden frequency change is neglected, then after only eight hours, a complete rotation of the pulsar is lost in our counting, and we can no longer determine at which rotational phase the gamma-ray photons reach the detector aboard Fermi, " Pletsch explained.

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