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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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Sci-Tech Dictionary. McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.  Read more