Time zones for countries around the world can be determined using the map above. World Time Zones (click to see larger image) So the local time in Toledo is 16:25 (=4:25pm). Toledo is in the Eastern Standard Time zone, so:īut since Toledo observes Daylight Saving Time in June, we must ADD one more hour to the standard time. If Daylight Saving Time is in effect in the time zone, you must ADD one hour to the standard time.įor example, let's assume that an eclipse begins in Toledo, Ohio on June 20 at 20:25 UT. Pacific Standard Time (PST) = UT - 8 hours Mountain Standard Time (MST) = UT - 7 hours In order to convert such predictions from UT to local time, you need to know what time zone you are in.įor 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 Most astronomical 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. Universal Time (UT) is the precise measure of time used as the basis for all civil time-keeping.Īlthough their exact definitions differ, most readers can assume that Universal Time is equivalent to Greenwich Mean Time (GMT). Or we can measure time based on the rotation of Earth on its axis with respect to the stars (Universal Time).įinally, we can measure time through the oscillations of atoms (International Atomic 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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