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| Pope Gregory XIII |
The effort to unify all measures of time has led to the establishment of a "universal time" according to which all the official clocks of the world that are governed by our system are adjusted.
That time is the result of the measurements of powerful atomic clocks that are only wrong one second for every million years.
The responsibility for their care and adjustment lies with the Office of Weights and Measures of Sèvres in France. Another factor in weighting the exact time is the measurement of the displacement of the planet that is carried out at the International Service for Earth Rotation Measurements in Paris.
A FACT
Did Cervantes and Shakespeare die on the same date?
Cervantes died, officially, on April 23, 1616... of the Gregorian calendar, which was already in force in Spain. And Shakespeare also did so, in effect, on April 23... but from the Julian calendar (May 3 in the Gregorian calendar), still in force in England.
In other words, they actually died 10 days apart.
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