What does AT stand for?

Designed with the frequent traveller and everyday user in mind, the atomic time keeping system ensures perfect timing via UK and European radio signals.

Some scientists now say GMT should be replaced by International Atomic Time — computed outside Paris — because new technologies have allowed atomic time to tick away with down-to-the-nanosecond accuracy.

One is established by the atomic time pieces, which are accurate to billionth of a second per day.

At that point, atomic time and astronomical time are approximately the same, with the traditional astronomical second defined as 1/86,400th of a "mean solar day," the average time between two consecutive noons.

xReminder Pro goes further when the competition stops; in addition to now standard features - like customizable event schedulers, various alarm types, printing options, data import/export and so on - this software comes with a floating clock, atomic time synchronizer, timer, and national holiday support for 30 different countries, to name a few handy perks.

With the measurement of the atomic second so exact, the earth is not in synch with atomic time.

The frequency of the reference maser is determined by comparing it to the frequency of International Atomic Time (TAT).

Some scientists now say GMT should be replaced by International Atomic Time — computed outside Paris — because new technologies have allowed atomic time to tick away with down-to-the-nanosecond accuracy.