A-1 time

0.01 sec.

A-1 time [¦ā ¦wən ‚tīm]

(astronomy)

A particular atomic time scale, established by the U.S. Naval Observatory, with the origin on January 1, 1958, at zero hours Universal Time and with the unit (second) equal to 9,192,631,770 cycles of cesium at zero field.

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