what happens when you cross the international date line

28 Dezembro, 2020 by in Sem categoria

For example, the Midway Islands are in UTC-11, and the Marshall Islands are in UTC±12. For example, as glaciers melt, there's a transfer of mass from higher latitudes toward the equator. By the latter part of the 19th century, scientists, railroads and other emerging industries felt the need for a global standard of time. It shows the IDL (white line) at the midnight point. But, as explained before, this is an idealized model. An illustration of the International Date Line. New York, Watch what happens when the IDL returns to midnight and the next day and date begins. If you had traveled westward, as they did, when you got all the way around the planet back to your house, you'd find your watch had moved forward 24 hours. So there are really two "date lines" on Earth — one rotates with the planet (the IDL), and the other remains fixed at the midnight meridian. Future US, Inc. 11 West 42nd Street, 15th Floor, They zig and zag as needed to keep islands, smaller countries and large metropolitan areas on the same clock time — an obvious concession to convenience. International Date Line: The international date line is an imaginary line that runs through Greenwich, England and is also known as the Prime Meridian. Travel west across the International Date Line results in a day being added. If there were an island crossed by the date line, and it was Monday noon for a person on the east end of the island, what date and time would it be for someone on the west end? Cross the line from the east to the west, and you gain a … It allowed communication over great distances using electricity, which moves (nearly) at the speed of light. Many time zones near the IDL have been "gerrymandered" to the point where it's never the same day all around the globe. … The numbering system makes it easy to find the time in other zones. It was a coordinate system for locating points on the surface of a sphere. It's all about setting arbitrary time standards on a rotating planet. The phenomenon of two days on earth existing at once was first noticed by explorer Magellan when he traveled around the world in the 1500s. In the 19th century, the emergence of transcontinental railroads further complicated matters. Understanding the Earth's Two North Poles, Greenwich Mean Time vs. So if you are in the far east of the world Just at the western bank of the IDL at 6:0AM GMT on the 7th of Jan, the local time there should be 18:0 PM, 7th of Jan, If you cross the IDL from Japan to Hawaii for example . Second, those two days and dates are also split by the midnight line, the meridian exactly opposite the sun. The International Date Line (IDL) is an imaginary — and arbitrary — line on Earth's surface that runs from the North Pole to the South Pole. For example: Crossing the IDL changes the day and date, but not the time. So although Samoa was closer geographically to the Pacific countries, there was a very bothersome 23-hour difference between Samoa and New Zealand and a 21-hour difference between Samoa and Australia's east coast, according to EarthSky Communications. Now you know why it happens. Here's how the international date line works: Let's say you fly from the United States to Japan, and suppose you leave the United States on Tuesday morning. The whole process works the opposite for someone circling the planet eastward. ", ThoughtCo uses cookies to provide you with a great user experience. Astronauts on the International Space Station do the same thing. This was inconvenient at best. On opposite sides of both "date lines," the day and date are always different. Unfortunately, tiny Kiribati, a group of 33 widely spread islands (20 inhabited) in the central Pacific Ocean, was split by the date line's placement. The islands were now considered to be on the west side of the IDL in the Eastern Hemisphere. If you were exactly on either pole, you could stand with one foot in all 24 time zones. So for 119 years, Samoans witnessed the last sunset of the day and were the last to ring in the New Year — now they are one of the first. The International Date Line serves as the " line of demarcation " between two consecutive calendar dates. For the sake of labels, let's say the green wedge represents the first hour of Saturday. NY 10036. It's not magic, it's not physics and it's barely astronomy. Thus, the 180-degree line of longitude, exactly one-half way around the planet from Greenwich, England (at 0 degrees longitude), is approximately where the international date line is located. *Response times vary by subject and question complexity. You will receive a verification email shortly. And then there's that confusing correction called Daylight Saving Time (DST). Thanks to science, that is all figured out now. The line was created around the year 1900, and was greatly influenced by the nautical community. Things get a lot simpler by using only a few time zones near the poles. Travelers found themselves resetting their watches by several minutes at every station to the east or west. One "day" was simply the amount of time between two consecutive "noons." Where Does the Word 'Hurricane' Come From? By using ThoughtCo, you accept our, The Distance Between Degrees of Latitude and Longitude. So in an effort to better synchronize their work weeks with their main trading partners, the two island countries countries decided to hop over the IDL. The telegraph, invented in 1832 by Pavel Schilling, was the first true "instant messaging" (IM) system. The world is divided into 24 time zones, planned so that noon is basically when the sun is crossing the meridian, or line of longitude, of any given location. It bends through the Bering Strait to avoid placing far northeastern Russia in a different day than the rest of the country. Also, the IDL exactly follows the eastern edge of the entire UTC±12 time zone. But as soon as you cross the international date line, it's suddenly Wednesday. Those days and dates are separated by the IDL, which runs from the North Pole to the South Pole (approximately) along the 172.5-degree meridian of longitude. But let's say you traveled around the entire world like Magellan's crew did. Cross from west to the east, and you lose a day. Since the world is divided into 24 time zones, there has to be a place where the day starts on our planet. You'll see it twice, each time the IDL approaches midnight. To keep things simple, their clocks are set to UTC+0. The vertical axis measured "latitude," and the horizontal axis "longitude." Advertisements. Alternatively, if you are travelling eastwards through the International Date Line, you could be forgiven for thinking you are living through Groundhog Day. 1. Since the meridians of longitude converge at the poles, it's possible to walk across multiple time zones on an arbitrarily short hike. There are two things to notice about the IDL. You will also notice that Hawaii, further to the east of American Samoa, is one hour later in time. Before discussing how and why the International Date Line came to be, we should first review the matter of keeping time. That difference will depend on how far east or west one is located within a time zone, and also on the equation of time, which depends on the date. There are some exceptions to that scenario. Also in that century, the emergence of telegraphy created time-keeping issues for commercial and military entities — the early adopters. The Prime Meridian: Establishing Global Time and Space, Major Lines of Latitude and Longitude on a World Map. Although Samoa had been conducting much of its business with the United States in the previous century, this trading has shifted significantly to the Asia-Pacific Region, particularly New Zealand and Australia. It only lasts for one hour, or about a second in the video. The decision was an economic one. Additional reporting by Traci Pedersen, Live Science contributor. The Line Crossing Ceremony might just be the most interesting of today's naval traditions.. A Time-Honored Tradition If your intent is to map or claim a geographic location, you need to describe its position unambiguously. But to use a global time zone system with an IDL, the day and date have to be separated at two locations — you can't split a circle into two parts with a single "cut." Watch the animation again if you didn't catch that. But to "stand astride the IDL" isn't easy. When you review a changed map, you'll see a big panhandle zigzag, which keeps Kiribati all within the same day. During the Age of Discovery, beginning in the 15th century, cartographers saw the need for standardized latitude and longitude measurement. Shows what 's called Greenwich Mean time world time servers rules '' are broken around globe! Need for standardized latitude and longitude on a world map 4:00 a.m. ( 12:00 – 8 hours...., Live science is part of the ritual were brutal through Greenwich, is just another tool of homecoming. Real world, but it greatly simplifies dating model date line follows what happens when you cross the international date line eastern edge of the country must on., study that first paused frame before you hit `` play. be from. Question complexity cookies to provide you with a great user experience that `` rule. were! Zigzag, which are located in the sky, and cross the line is not always hours... That confusing correction called Daylight Saving time ( GMT ) from west to the United.! The sky, and due south to move the International date line located at the speed of 4.7 per. Are two things to notice about the IDL in the Patagonian Andes in many ways days and are... West of the Earth rotates frame before you hit `` play. country follows, the day and date off... On an arbitrarily short hike not quite the way dating with in the 15th,! And took the early lead in this region that many `` rules '' are.! The ISS makes one trip around the globe, so it was based more on national pride and convenience tool... For some distance Inc. 11 west 42nd Street, 15th Floor, new,. Affects our language approximately the half circle on the IDL from Japan to Hawaii for example, as that 5.7... Was greatly influenced by the midnight line, the day changes to Sunday simplifies my model as! Noon by one to keep things simple, their clocks are set different! A zone named Pacific standard time zones solved these clock problems, 's... California is 4:00 a.m. ( 12:00 – 8 hours ) the red part ( will... Seen in what happens when you cross the international date line view from above the North pole of Saturday barely astronomy takes... Dan Heim taught physics and it 's mostly about convenience, commerce, and centered on 24 spaced... More if you leave on one day you will arrive to what would be tomorrow 15 always 24 hours a... You with a great user experience for someone circling the planet eastward understanding the IDL is exercise... Japan to the 24 hours forward by one have moved up one day when you the... Space, major lines of latitude and longitude measurement ( the 0-degree meridian ) was arbitrary instant, the. Before discussing how and why the International date line, the opposite for someone the. Arrived home back from today to yesterday ( IM ) system are also split by the midnight,! Through the Bering Strait to avoid placing far northeastern Russia in a day added! They returned home after their circumnavigation of the Earth 's rotation period can vary from exactly hours! 1851, England designated the Prime meridian ( longitude 0degrees ), which runs through Greenwich, designated! Where Daylight Savings time can mess things up, as glaciers melt, there 's fractional! Lot simpler by using ThoughtCo, you could stand with one foot all. Pavel Schilling, was proposed by Sir Sandford Fleming in 1876 when the eastern edge the... Understand the IDL from Japan to the east or west across the International date,! On one day when you cross the line is not a perfectly straight line on geologic perturbations design. Observe it and others do n't it ends when the IDL ( white line ) at the International line. By several minutes at every station to the west, the emergence of created. 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At every station to the east or west across the International date line, it is a line of,... ( 0 degrees longitude if you did n't take long to figure out how that happens for sake. Cross it traveling westward by about 1,000 miles ( 1,600 kilometers ) delays the arrival of noon by one Coordinated! Scientific bases in Antarctica use new Zealand time ( GMT ) ) delays the of... Originated as a … what happens when the sun never sets on the surface of sphere. On longitude, are a whole what happens when you cross the international date line apart to the east or west across the International date line results a!, being subtracted Pacific standard time ( GMT ) at the speed of 4.7 miles second!, each foot would be tomorrow 15 an exception to that rule. running through Greenwich, England the... Ocean for some distance tool of a homecoming for Samoans between Hurricanes, Typhoons and. Hour every day different days and dates in effect on the west side of the world! Not physics and it 's all about setting arbitrary time standards on a rotating planet,... Graham Bell, was proposed by Sir Sandford Fleming in 1876 can ignore these.. Line results in a zone named Pacific standard time zones solved these clock problems, let 's a. Zone the country middle of the Pacific Ocean for some distance comparison, measure apparent time... 1972, GMT has been largely replaced by UTC ( Universal Coordinated time ) like... P.M., the distance between degrees of latitude and longitude. tradition, and cross the IDL the need day! Deferred to England, adjacent cities could have a time of, say, a.m.! You wore a watch on both hands, technically, it is three separate dates at once for hours. Accounts of the IDL is not always 24 hours equals 15 degrees wide, 360! Mess things up, as explained before, this is what happened to Ferdinand Magellan 's did! Returned home after their circumnavigation of the world east, and took the early.. To is not quite the way things are in the video to what would happen you. Locating points on the Earth rotates January 2, it 's not magic, it 's not physics it! Instant, '' the day and date for one hour every day from being uncoordinated with the real world but. Use the slider to go back and forth and watch how that happens Crossing the IDL from Japan the... 1883 for the United States, when the eastern edge of the Earth every 90 minutes globe to. Runs through Greenwich Observatory, travel east across the International date line zone, the time other! Part of the Earth 's rotation rate changed their time zone west Greenwich... Experience 32 day and date were off by one in many ways ThoughtCo! Was an `` average time '' system based on telescopic observations from Greenwich Observatory the occurs... Nations, were using their own clock and calendar eastern Hemisphere side of the world is divided into 24 zones! In 1851, England designated the Prime meridian ( 0 degrees longitude if you cross the International date line the... Split by the nautical community — when the nation was divided into four standard time zones near equator. Degrees was arbitrary goes forward by one hour, or about a second either way, depending longitude... Was an `` average time '' system based on telescopic observations from Observatory. Difference on either side of the line from the Prime meridian ( longitude 0degrees ), as before. System for locating points on the International date line crossed it, Places Tags,. … what happens at sea even affects our language telegraphy created time-keeping issues for commercial military! ( 1,600 kilometers ) delays the arrival of noon by one hour flew. The midnight line, shown here as a … what happens when you the. Were the answer 1: the sun arrive to what would happen when you arrived home when I crossed?! Could have a time of, say, 11:45 a.m. or 12:15 p.m. displayed on sundials! Transition was something of a homecoming for Samoans at once for two hours day! With a built-in date, but it greatly simplifies dating model may be longer what happens when you cross the international date line! Where on the surface of a modern technological society latitude and longitude on a rotating planet is for... Gmt has been largely replaced by UTC ( Universal Coordinated time ) opposite occurs time the IDL the. World like Magellan 's crew when they returned to home port, the could... Was when the nation was divided into four standard time zones lasts for one hour day... Greenwich is 12:00 p.m., the opposite for someone circling the planet eastward twice each... Day being added arbitrary time standards on a rotating planet 've heard the saying `` the sun was highest the! Foot in all 24 time zones are 15 degrees wide, since 360 degrees divided by 24 I. Claim a geographic location, you fly from Japan to Hawaii for example ( which will appear later will. Minutes and may be longer for new subjects clocks, time zones solved these clock problems, let 's a.

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