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International Date Line
The International Date Line is a line of longitude roughly located at 180 degrees. It marks the two different days on Earth, where 24 hours is added or subtracted when one crosses the line.
692 Questions
How are the prime meridianand the inernational date line related?
They are the two halves of the same circle.
Is the Date line a parallel or a Meridian?
The short answer is "no."
The somewhat longer and slightly more accurate answer is "neither, but of the two it's a lot more like a meridian."
Why is international date line opposite the prime meridian?
The 180th meridian or antimeridian is used as the basis for the International Date Line because it for the most part passes through the open waters of the Pacific Ocean separating the east and west hemispheres.
How many degrees from the greenwich meridian is the international dateline?
The Greenwhich meridian also Prime Meridian is 0 degrees longitude and International Date Line roughly follows the 180° longitude or antimeridian.
The antimeridian is the meridian which is 180° east or west of the Prime Meridian.
Where is the international date line in relation to California?
It's a good 2,900 miles or more due west from any spot in California ...
very roughly the same as going from San Francisco to Washington, and
then continuing past it for another 400 miles.
What does E6 stand E6 in ICH GCP guidelines?
E6 refers to the International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use (ICH) guideline on Good Clinical Practice (GCP). This guideline sets out the standards for designing, conducting, recording, and reporting clinical trials involving human subjects. It ensures that the rights, safety, and well-being of trial participants are protected, and that the data generated is reliable and credible.
Some countries use a . in place of a :, so 2.32 is the same as 2:32.
Why does the international date line vary from the 180th meridian in place?
That was done in order to avoid splitting any single country, island group, or state
into two different calendar dates.
If the IDL had followed the 180° meridian exactly, one of the island groups that would
have been affected is the Aleutian chain. Had the line not jogged, then the state of
Alaska, and therefore the USA, would have always had two different calendar dates
going on within its borders.
What continent is cut in half by prime meridian and the international date line?
I'm not sure it's exactly 50-50, but you're describing Antarctica.
What is the latitude and longitude of the point of the equator and the international date line?
The point where they cross is zero latitude / 180° longitude.
What continent or ocean doe the equator and the international date line cross?
The equator crosses South America, Africa, and Asia.
The IDL crosses only Antarctica.
What is the effect of crossing international date line?
You either gain or lose a day - depending on which direction you're travelling.
What are the two hemispheres divided by the prime meridian and the international date line?
The eastern and western ones are.
What side is the prime meridian and what side is the international date line?
The Prime Meridian is located at 0 degrees longitude and runs vertically through Greenwich, England, marking the division between the Eastern and Western Hemispheres. Conversely, the International Date Line is situated approximately at 180 degrees longitude, opposite the Prime Meridian, and serves as the boundary for calendar days, marking the transition between one day and the next.
0900 Greenwich Mean Time =
2200 Samoa Standard Time =
2300 Hawaii-Aleutian Standard Time =
0000 Hawaii-Aleutian Daylight Saving Time =
0000 Alaska Standard Time =
0100 Alaska Daylight Saving Time =
0100 Metlakatla Time =
0100 Pacific Standard Time =
0200 Pacific Daylight Saving Time =
0200 Mountain Standard Time =
0300 Mountain Daylight Saving Time =
0300 Central Standard Time =
0400 Central Daylight Saving Time =
0400 Eastern Standard Time =
0500 Eastern Daylight Saving Time =
0500 Atlantic Standard Time =
1900 Chamorro Standard Time
What time is it EST when it's 1PM CET?
There are two different time zones abbreviated EST. 1 PM CET = 7 AM EST in North America and 10 PM EST in Australia.
Which kind of people work at night time?
People who do the kind of jobs that need to be done at night time.
Some examples include:
-- radio announcers
-- fire fighters
-- police
-- astronomical observatory technicians
-- ambulance attendants and EMTs
-- taxi drivers
-- Las Vegas casino dealers
What is GMTtime for 2AMPacific time?
2 AM Pacific Standard Time = 10 AM Greenwich Mean Time
2 AM Pacific Daylight Saving Time = 9 AM Greenwich Mean Time
Crossing the International Date Line when traveling from Rarotonga to Auckland is significant because it results in a change of date. Rarotonga, in the Cook Islands, is located just east of the Date Line, while Auckland, New Zealand, is just west of it. Therefore, when a traveler moves from Rarotonga to Auckland, they effectively "gain" a day, meaning if they leave Rarotonga on a Monday, they will arrive in Auckland on the following day, Tuesday. This shift can affect travel plans, scheduling, and time management for travelers.
How will you gain a day if you cross the international date line from west?
You "gain" a day because when you cross the IDL in the easterly direction, you
take the last page that you tore off of your calendar, and glue it back on, thus
gaining the ability to live the past 24 hours again.
How do you gain a day if you travel west across the international date line?
You don't gain a day by traveling West, only by traveling East. You lose a day going West.
When was international date line established?
The very quick answer: It was never actually established by any kind of international law or agreement.
The history link below is particularly helpful, if rather detailed. First mention of the 'circumnavigator's paradox', the loss or gain of one day for those travelling around the globe, is from a Syrian prince and historian during the late 1200's or early 1300's. Later geographers and philosophers made reference to it. With Magellan's (1480-1521) historic circumnavigation, the paradox was at last experienced.
Since Magellan there have been a few different ways to solve the problem, as the history shows. As far as I can determine, there has never been set by any international agreement the actual location of what we now call the International Date Line; it came about essentially through convention and common use. Any nation is free to establish whatever standard time it sees fit, and this includes dates.
The International Date Line is theoretically the line of 180 degrees longitude, the meridian exactly opposite the Prime Meridian or Greenwich Meridian. From the beginning, various nations on or near to the 180 degree meridian have established that they are on one side or the other of the 'date line', and its 'location' is always subject to change.
The location of the date line is independent of the time zone(s) that span a nation or territory. The easternmost region of the Pacific island nation of Kiribati, Caroline Island, experiences midnight as it always has relative to locations to its north and south. but since 1995 Kiribati declared that midnight at Caroline Island marks the beginning of the day to the west of the International Date Line; Kiribati 'moved' the line to its east.
If you and a friend are standing face to face with the IDL between you, the one to the west is one day advanced compared to the one to the east. It would have been less drastic for Kiribati to 'move' the dateline to its west instead, leaving all of Kiribati on the same side of the line as North and South America. Some have argued that the arbitrary move was to foster tourism, since Caroline Island became, by definition, the first location on earth (along with Antarctica, of course) to experience the change of millennium.
The Prime Meridian was internationally decided by the International Meridian Conference of 1884, but that conference did not presume to fix or decree the location of the date line or boundaries of time zones, wisely concluding that these were matters for sovereign nations to decide for themselves. In fact the location of a prime meridian and of a date line, while very important, are entirely arbitrary, and have nothing whatever to do with any special characteristic or property of any part of the globe.
