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International Date Line – Map and Details

Text on this page is printable and can be used according to our Terms of Service. Skip to content Donate Account. Laser Meridian Today, the prime meridian is marked by a laser beam that shoots out northward from the Royal Observatory in Greenwich, England. The meridian at longitude is commonly known as the International Date Line. At points to the east of the Date Line the calendar is one day earlier than at points to the west of it.

International Date Line – Map and Details

The Date Line makes a zigzag in the north to incorporate the eastern tip of Siberia into the Siberian time system and then another one to incorporate a number of islands into the Hawaii-Aleutian time zone. Cross the line from the east to the west, and you gain a day. It bends through the Bering Strait to avoid placing far northeastern Russia in a different day than the rest of the country, international date line east. The meridians are traditionally counted from the meridian of the observatory of Greenwich, in England, which is international date line east the zero meridian. The international date line is not a perfectly straight line. Last Updated Feb. Next...

The International Date Line (IDL) is an imaginary — and arbitrary — line on . Eastern Standard Time (EST) at 75 degrees W (west of the Prime. International Date Line n. An imaginary line through the Pacific Ocean roughly corresponding to ° longitude, to the east of which, by international. The International Date Line is an imaginary line on the surface of the Earth that sits mostly People crossing the line from East to the West skip forward a day.:

The two natural cycles on which time measurements are based are the year and the day. The year is defined as the time required for Earth to complete one revolution around the Sun, while the day is the time required for Earth to complete one turn upon its axis. Earth needs days plus about 6 hours to go around the Sun once, so a year does not consist of a round number of days; the fractional day has to be taken care of by an extra day every fourth year. But because Earth, while turning upon its axis, also moves around the Sun, there are two kinds of days. A day may be defined as the interval between the highest point of the Sun in the sky on two successive days. This, averaged out over the year, produces the customary hour day.