Universal Standard Time

Time can be measured in a number of ways. For instance, we can measure the passage of time via the orbital motion of Earth and other planets in the solar system (Dynamical Time). Or we can measure time based on the rotation of Earth on its axis with respect to the stars (Universal Time). Finally, we can measure time through the oscillations of atoms (International Atomic Time).

Universal Time or UT is the precise measure of time used as the basis for all civil time-keeping. Although their exact definitions differ, most readers can assume that Universal Time is equivalent to Greenwich Mean Time or GMT. Universal Time is actually based on the mean sidereal time as measured in Greenwich, England. It's also approximately equal to mean solar time from Greenwich.

Time

Like most other astronomical calculations, eclipse predictions are usually presented in terms of Universal Time. In order to convert eclipse predictions from UT to local time, you need to know what time zone you are in. For North Americans, the conversion from UT to local time is as follows:

Most relevant lists of abbreviations for UST (Universal Standard Time). 1 ways to abbreviate Universal Standard Time. How to abbreviate Universal Standard Time? Get the most popular abbreviation for Universal Standard Time updated in 2021. Coordinated Universal Time (UTC), UTC +0. The IANA time zone identifier for UTC is UTC. Read about UTC in Wikipedia. Make UTC time default. Add to favorite locations. Universal Time or UT is the precise measure of time used as the basis for all civil time-keeping. Although their exact definitions differ, most readers can assume that Universal Time is equivalent to Greenwich Mean Time or GMT. Universal Time is actually based on the mean sidereal time as measured in Greenwich, England.

If Daylight Saving Time is ineffect in the time zone, you must ADD one hour to the abovestandard times.

For example, let's assume that an eclipse begins in Toledo, Ohioon June 20 at 20:25 UT. Toledo is in the Eastern Standard Timezone, so:

Universal Standard Time

But since Toledo observes DaylightSaving Time in June, we must ADD one more hour to the abovetime. So the eclipse will begin at 16:25 (=4:25pm) local time. Universal Standard Time

Time zones for countries around the world can be determined witha special TimeZone Map courtesy of HM Nautical Almanac Office,Royal Greenwich Observatory. Just remember that you'll need tocheck with your travel agent or with a guide book to find out if Daylight Saving Time is practicedduring that time of year.

StandardUniversal Standard Time

Coordinated Universal Time (or UTC) is based on atomic time. Itis synchronized and adjusted to stay within 0.9 seconds ofUniversal Time (UT). Occasionally, a 'leap second' is added to UTCin order keep it in sync with UT (which varies due to Earth'srotation).

The official source of time used in the United States is theTime Service Department of the U.S. Naval Observatory. The currentUTC is shown below:

U.S. Naval Observatory MasterClock
Reload Frame to Update Clock

Standard

You can use the time on the U.S.N.O. Master Clock to determinehow many hours different your local time is from Universal Time.Once noted, use this number to convert all eclipse prediction timesfrom UT to your own local time.

Universal Standard Time Converter

For example, if you are in the Eastern Standard Time zone, youwill see that your local time is 5 hours earlier than UT. In orderto convert any eclipse predictions from UT to local time (i.e. -EST), you must subtract 5 hours from UT:

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For more information on time reckoning and time zones, check outthe following sites:

Universal Standard Time Conversion

  • What isUniversal Time?- U.S. Naval Observatory
  • Current CoordinatedUniversal Time- U.S. Naval Observatory
  • What arethe U.S. Time Zones?- U.S. Naval Observatory
  • Local Times Aroundthe World- HiLink Internet
  • World TimeZones- R. E. Schmidt, U.S. Naval Observatory
  • Systems ofTime- R. E. Schmidt, U.S. Naval Observatory
  • What is aLeap Second?- R. E. Schmidt, U.S. NavalObservatory
  • A WalkThrough Time- National Institute of Standards andTechnology