universal time 0
Also found in: Acronyms.
universal time 0[¦yü·nə¦vər·səl ¦tīm ′zir·ō]
The uncorrected time of the earth's rotation as measured by the transit of stars across the observer's meridian. Abbreviated UT 0.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.