![]() ![]() The Differences Between GMT, UTC, and IDL Take a look at the official world time zone map. So, we all end up getting 24 standard time zones and 14 additional exceptions.Īs a result, local time always depends on what time zone you're in at a given moment.Īs stated above, all nations have specific interests, so the time zone map is not linear as it should be in theory. With the rotation of the Earth, from east to west, each meridian represents one given hour. They're technically named meridians, i.e., imaginary lines that run vertically from the North Pole to the South Pole, each 15 degrees apart. However, in a world with borders, political, geographical, social interests, and lobbies, the officially established time zones make the planet look like a complicated geometrical drawing of longitudinal lines. Ideally, the planet would be divided between 24 identical time zones, each representing one hour of the day. When you fly between Los Angeles and New York, you must add three hours to your clock upon arriving at your destination.Īnd while someone is waking and getting ready for another working day under sunny skies, another is heading off to bed under the moonlight. As a result, time is always different in various places on the planet. Welcome to the complex world of time zones. Page Go to NASA Lunar Eclise Page Go to NASA Planetary Transit Page Go to NASA Eclipse Resource PageĮmail: NASA Representative: Robert M.What time is it? Here's how a common daily question can have multiple answers. Through Time - National Institute of Standards and įor more information on time reckoning and time zones, check out To convert any eclipse predictions from UT to local time (i.e. Will see that your local time is 5 hours earlier than UT. Once noted, use this number to convert all eclipse prediction timesįor example, if you are in the Eastern Standard Time zone, you ![]() How many hours different your local time is from Universal Time. The official source of time used in the United States is the In order keep it in sync with UT (which varies due to Earth's Occasionally, a "leap second" is added to UTC Is synchronized and adjusted to stay within 0.9 seconds of Just remember that you'll need toĬheck with your travel agent or with a guide book to find out if Daylight Saving Time is practicedĬoordinated Universal Time (or UTC) is based on atomic time. Zone Map courtesy of HM Nautical Almanac Office, Time zones for countries around the world can be determined with So the eclipse will begin at 16:25 (=4:25pm) local time. Saving Time in June, we must ADD one more hour to the above Pacific Standard Time (PST) = UT - 8 hoursĮffect in the time zone, you must ADD one hour to the aboveįor example, let's assume that an eclipse begins in Toledo, Ohio Mountain Standard Time (MST) = UT - 7 hours For North Americans, the conversion from UT to local time is as follows:Ītlantic Standard Time (AST) = UT - 4 hoursĮastern Standard Time (EST) = UT - 5 hoursĬentral Standard Time (CST) = UT - 6 hours In order to convert eclipse predictions from UT to local time, you need to know what time zone you are in. Like most other astronomical calculations, eclipse predictions are usually presented in terms of Universal Time. It's also approximately equal to mean solar time from Greenwich. ![]() Universal Time is actually based on the mean sidereal time as measured in Greenwich, England. Although their exact definitions differ, most readers can assume that Universal Time is equivalent to Greenwich Mean Time or GMT. Universal Time or UT is the precise measure of time used as the basis for all civil time-keeping. Finally, we can measure time through the oscillations of atoms (International Atomic Time). Or we can measure time based on the rotation of Earth on its axis with respect to the stars (Universal Time). ![]() For instance, we can measure the passage of time via the orbital motion of Earth and other planets in the solar system (Dynamical Time). Time can be measured in a number of ways. ![]()
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