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.

2,080 Questions
Biology
Units of Measure
International Date Line

Where is all time measured from?

The official time all around the world is measured according to cesium atoms.

It turns out that the unchanging transition period of a cesium atom is exactly equivalent to one second. Unlike solar or lunar-based measurements, cesium seconds don't change with latitude or altitude. Since 1997, cesium has been the standard for measuring time.

Answer:

As to where time is measured from, the Prime Meridian, which runs through Greenwich, England, is used as the starting point for the time zones that are used in determining time around the world. All time zones are designated as being either plus or minus from GMT (Greenwich Mean Time), also known as UTC (Coordinated Universal Time). These time zones continue east and west until reaching the International Date Line which runs (more or less) along the 180th meridian.

Several organisations, but most notably the U.S. Naval Observatory, maintain atomic clocks. A "cesium(-beam) atomic clock" (or "cesium-beam frequency standard") is a device that uses as a reference the exact frequency of the microwave spectral line emitted by atoms of the metallic element cesium, in particular its isotope of atomic weight 133. 1 second = 9,192, 631,770 cycles of the standard Cs-133 transition. The USNO master clocks are in Washington, D.C. The alternate master clocks are near Colorado Springs, CO.

325326327
Math and Arithmetic
Geometry
International Date Line

How many lines of symmetry does a hexagonal prism have?

Regular polygons have lines of symmetry equal to the number of sides/angles that they possess so a hexagon would have 6 lines of symmetry. (:

* * * * *

However, the question is not about a polygon but a polyhedron! A prism with regual hexagonal bases has six lines of symmetry at the bases, but it also has a line of symmetry along the centre of its length. Furthermore, there are infinitely many lines of symmetry in the plane that divides it halfway along its length.

101112
Geography
Latitude and Longitude
International Date Line

What happens when you cross the international date line moving from west to east?

Nothing in particular happens. If you happen to be napping aboard the ship or the

airliner at the moment of crossing, you can sleep right through it, just as you do

when you cross any other meridian of longitude.

However, by international agreement, your calendar date becomes one day earlier

when you cross the International Date Line going east. You should make the appropriate

changes sometime between crossing the line and arriving at your destination, otherwise

you're out of sync with everybody else when you get there.

207208209
Geography
International Date Line

Why isn't the international date line staraght?

It was deliberately designed like that so it would not intersect any countries or islands. Otherwise you would countries and islands with parts of them with different dates, which would cause a lot of confusion.

See the Related Link for more information.

169170171
Indonesia
Continents
International Date Line

Indonesia lies between which two continents?

Indonesia is a nation in Southeast Asia, it is south of mainland Asia and north of Australia.

113114115
Math and Arithmetic
Length and Distance
International Date Line

How many feet are there in a quarter of a mile?

One mile is equal to 5280 feet. therefore, one quarter of a mile is equal to 1/4 x 5280 = 1320 feet.

636465
Visas - Document
International Date Line

How check iqama expiry date?

iqama expire date nestor madura gultiano jr

606162
International Date Line

What happens when the ship crosses the international dateline from west to east?

Nothing in particular happens; if you happen to be napping aboard the ship at the

moment of crossing, you can sleep right through it, just as you do when crossing

any other meridian of longitude.

By international agreement, however, your calendar date becomes one less when

you cross the International Date Line going east.

113114115
Earth Sciences
Geography
Latitude and Longitude
International Date Line

The prime meridian passes through wich three continents?

It passes through Africa, Europe and Antarctica.

919293
Disney Theme Parks
Air Travel
International Date Line

How do international travel organisations play a vital and responsible role in the air travel industry?

duties-to promote,to provide or to co operate with international civil aviation organization and other international organizations.

107108109
Geography
Latitude and Longitude
International Date Line

How do you change your watch and calendar when you cross the international date line going west?

Going west, you must tear the current day off of your calendar and dispose of it

when you cross the IDL. Immediately as you cross, the date becomes one day

later.

It's not necessary to do anything to your watch, unless it's a calendar watch. If it is,

then you do whatever you must in order to make it indicate one day later, but you

make no change to the time.

103104105
Latitude and Longitude
International Date Line

What is the significance of crossing the international Date Line when travelling Rarotonga to Auckland?

Since the Earth is spherical (shaped like a ball), you can head out of Rarotonga in

either direction, either east or west, and eventually wind up in Auckland. The trip is

quite a bit shorter, though, if you travel westward, and that will take you across the

International Date Line. At the moment of crossing the line, the right things to do are

to advance your calendar by one day, and turn your clock ahead 24 hours. For example,

if it happens to be 3:00 PM on Tuesday, then it becomes 3:00 PM on Wednesday when

you cross the line. In reality, there's no need to make the adjustment exactly as you

cross the line. Passengers typically make the change when they board the ship or plane,

or when they disembark at the end of the trip. As long as you're actually at sea or in

the air, it really doesn't matter much what day it is.

878889
Math and Arithmetic
Geometry
International Date Line

How many lines of symmetry does a plus sign have?

4

757677
Geography
International Date Line

What is the International Date Line?

The International Date Line was established, beginning in 1917, as the arbitrary line of longitude at which a calendar day is said to begin.

Because the Earth rotates, and any clock hour could be local time somewhere in the world, a location was chosen to be the dividing point between calendar days.

As Greenwich was chosen as the central point of the Earth's lines of longitude, noon at Greenwich (when the Sun is directly overhead) was designated as midday. It follows therefore that on the other side of the planet, 180 degrees from Greenwich, it would be midnight, the ending of one calendar day and the beginning of another.

This line, which is 180 degrees east or 180 degrees west longitude, is therefore the line on which one day ends and a new day begins. The line runs through the Pacific Ocean from the North Pole to the South Pole passing between Russia and Alaska. The actual Date Line diverges from the meridian to accommodate national boundaries : eastward for Russia, westward for the Aleutians, and eastward for Pacific island groups and New Zealand.

At any time other than midnight, it is a different day on either side of the International Date Line. If you cross it heading west, you add a day. If you cross it going east, you subtract a day (in addition to making the hourly time changes, backward or forward, respectively).

838485
International Date Line

What happens when you pass the international date line west?

Nothing special happens. If the flight crew didn't tell you about it, you wouldn't

notice anything. It's handy to know about it, though, because when you cross

the IDL traveling west, you're supposed to turn your watch and your calendar

forward to the next day.

818283
Time Zones
Latitude and Longitude
International Date Line

Why isnt the international date line straight?

The International Date Line is nominally the line of 180 degrees longitude, both

east and west ... exactly opposite the Prime Meridian. The Line was drawn with

some jogs and zig-zags in it for political reasons, mainly to avoid having it split

island nations or contiguous areas of national interest.

Think of it this way: Have you ever been late for a dental appointment, or had to

post-date a check so you could move some money into the account to cover it ?

Do you think these things would be any easier if opposite sides of your city had

two different calendar dates ?

818283
Acronyms & Abbreviations
Time Zones
International Date Line

What is the meaning of A.M and P.M?

these are latin words. a.m. - ante meridiem and p.m. - post meridiem.

shyam

09319432575

313233
Geography
Hemispheres
Latitude and Longitude
International Date Line

What is the Prime Meridian and where is it located?

See related link for more information. _________ The Prime Meridian is based on Greenwich, England, the longitude of which is 0 degees. The other meridians are calculated from the Prime Meridian. Knowing where you are in relation to the Prime Meridian is the basis of all nautical navigation which was the reason for its establishment.

757677
Latitude and Longitude
Equator
International Date Line

What is the longitude of the prime meridian?

The longitude of every point on the Prime Meridian is Zero.

293031
Italy
Flight Times
International Date Line

How many hours if the flight from Pittsburgh to Rome Italy?

Flight:

Pittsburgh, PA (PIT) to Rome (ROM)

Flight Duration * 10 hours 46 mins * Via Washington Dulles International Apt, Washington (IAD) Distance:

The distance between Pittsburgh, Pennsylvania and Rome, Italy is 4569 miles (7354 km).

707172
Geography
Latitude and Longitude
International Date Line

How many degrees east is the international date line from Greenwich?

For the most part, the answer is 180 degrees. However, the international date line doesn't completely follow the 180 deg longitude line; it bends around Russia, the Aluetian Islands of Alaska, and several islands of the southwest Pacific.

656667
International Date Line

The Prime Meridian passes through?

Greenwich

345
International Date Line

Why do you lose a day traveling east on the International Date Line but gain one going west?

You do not lose a day if you go from March 12 to March 11. You get to live March 11 again.

616263
Travel & Places
Mapping and Cartography
Latitude and Longitude
International Date Line

What is a map used for?

A map can be used for many different purposes. To find out how to get somewhere, to look over a paticular state or country, or to show you where things are.

474849
California
Time Zones
International Date Line

What is the time difference between Florida and California?

The eastern 87% of Florida (UTC-5/UTC-4) is almost always 3 hours ahead of California (UTC-8/UTC-7). The portion of the Florida panhandle west of and including Jackson and Calhoun Counties and part of Gulf County (UTC-6/UTC-5) is almost always 2 hours ahead of California.

When the time in California is 4 AM PST, the times in Florida are 6 AM CST and 7 AM EST. When the time in California is 5 AM PDT, the times in Florida are 7 AM CDT and 8 AM EDT.

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