International Date Line

Father's Day is celebrated on the first Sunday in June in many countries and can be any date from June 15 to June 21. In some countries, Father's Day is celebrated the first Sunday in September, so the date can be September 1 to September 7. Other countries celebrate Father's Day in other months and days.

Maha Shivaratri is celebrated on different dates across India. Some celebrated on 25th of February and some on 29th February in the year 1984.

180 degree meridian is the meridiam ospposite to the Prime Meridean or The Greenwich Meridian. It helps to find the location of a place. The 180 degree west and the 180 degree east are the same meridians.

Whereas, the International Date Line or the IDL is an imaginary line that runs ALONG the 180 degree meridian. It bend slightly to avoid land. If a person travells eastward of it , he /she gains a day, but if a person travells westward of it he/she loses a day.

In a world in which people commonly travel great distances, it is necessary to have some means of keeping track of how the time of day changes in different parts of the world, and it is necessary to have an international date line. There is no absolute necessity for the international date line to be where it is; that was a reasonable choice but not the only possible choice. But we definitely need to have an international date line somewhere. At some point, the far east meets the far west, and one day becomes another day. It has to happen, for our time keeping system to make sense on a global scale. If you just stayed in the same city for your whole life, you would never need an international date line (or a passport). But in the age of jet airplanes, we travel a lot.

not sure what is up with all that^ but from the north pole to the south pole on one side of the world the international date line is the international date line. On the other side of the world The international date line is the

prime meridian

The difference is 180 degrees of longitude. They're two different [imaginary] lines

on the earth's surface, directly opposite each other. The Prime Meridian connects

the north and south poles and runs through Europe and Africa. The International

Date Line also connects the north and south poles, but runs down the other side

of the earth, through the Pacific Ocean. If you stand at any point on either one of

them (except at the north or south pole), then you can't see any point on the

other one.

The International Date Line follows the 180th meridian except where it shifts eastward around Siberia, westward around the Aleutian Islands, eastward around the Fiji Islands and New Zealand, and it is offset as far as 174o 54' W to avoid cutting through the Pacific island republic of Kiribati in Micronesia.
The International Date Line is nominally the line of 180 degrees longitude, both east and west ... exactly opposite the Prime Meridian and half-the-earth away from it. 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.

The 180th meridian is also called the International Date Line because that is where the day changes from one day to the next. Keep in mind that the date change does not follow exactly the 180th meridian and moves slightly east or west as necessary to accommodate the desires of the various countries that lie along it.

The Prime Meridian is the imaginary line defined as zero longitude. It joins the

north and south poles and passes through England, Spain, France, Mali,

Burkina Faso, Togo, Ghana, and Antarctica. On its way through England, it

crosses a certain mark on the floor of a certain room at the Royal Observatory

in Greenwich, outside London.

The meridian of 180° longitude is exactly opposite the Prime Meridian and

together, they form a complete circle. That meridian also joins the north and

south pole, and passes through the Pacific Ocean for most of its length.

The International Dateline roughly follows the meridian of 180° longitude, but

departs from it with zigs and zags in several places, in order to avoid splitting

any single state, country, or island group into two different calendar dates.

the time zone a place is in

It passes through the middle of the Pacific Ocean.

The International Date Line (IDL) roughly follows the 180° longitude which is called the 180th meridian or antimeridian. The line deviates to pass around some territories and island groups (Fiji, Tonga, Samoa, etc). The Date Line deviates from the straight line of longitude to keep it from passing through countries such as the USA (Alaska), Russia (Wrangel Island and Chukchi Peninsula), or New Zealand, and island nations such as the Marshall Islands and the Aleutian Islands.

It would depend where you are on the other side. For instance, if you are in London, it could be Monday already depending on the time in the US, and where you are in relation. Say you are in New York and it is 10 PM. Sunday evening, it would be 3 AM in London on a Monday morning. Remember if your going east, you add a day. Going west you subtract. The international date line runs through the Pacific Ocean. This is not completely accurate; if traveling east on a flat map then it is correct. But if for example you are flying from the United States to Australia (the other side of the world), you fly west. Flying to Australia from the US, the time zones advances a day not substract a day. To fully answer your question then the above statement is correct, it depends on where you are and the time of day to determine the day on the "other side of the world." On a flat map, everything "east" of the US does adavance a day but the time zones are different.

-- The continents immediately to the east of it are North America and South America.

-- The continents immediately to the west of it are Asia and Australia.

-- It cuts right across half of Antarctica.

If the International Date Line was a straight line it would be the 180° longitude line. The line intersects part of Russia (eastern part of Siberia) as well as some some territories and island groups such as Fiji. The 180° longitude line also goes between in New Zealand and its territory Chatham Islands such that New Zealand is in the eastern hemisphere and the Chatham Islands is in the western hemisphere.

Longitude on the Prime Meridian is zero. Half-way in a westerly direction between zero

and 180 degrees is 90 degrees west longitude. Some places at that longitude include

locations in Ontario Canada, Lake Superior, Wisconsin, Illinois, Arkansas, Louisiana,

the Gulf of Mexico, Mexico, Belize, Guatemala, the Pacific Ocean, and Antarctica.

That was strictly a matter of international agreement. Unlike the equator, which is

defined in terms of the shape of the Earth, the origin of longitude could have been

anywhere that everyone agreed on. England had the largest worldwide empire, and

the longest seafaring tradition and history, and the Royal Observatory in place to

verify and monitor the measurement, and took the initiative to organize the

international conference to set up the uniform, global navigation reference system,

where it was agreed that the meridian through the Royal Observatory in Greenwich

would become the zero reference for longitude.

If westbound, the day changes to the next day. If eastbound, the day is the day before. Seems strange, but it all works out. Let's imagine we're on the beach in the early evening west of the dateline at 4:59 PM Tuesday. If we swim eastward across the dateline and continue east seven time zones, it will be 11:59 PM Monday. We rest from all this exercise and ponder the strangeness of turning back a day. Whew! One more minute and it will be Tuesday anyway. Continue 17 more time zones (24 total) eastward and it will be 4:59 PM Tuesday. Just like we left it. It works just fine in the reverse going the other way.

The Canadian, Sir Alexander Fleming, came up with the idea of dividing the earth into time zones using lines of longitude. Zero longitude runs through Greenwich Park in London and is marked by a bronze strip let into the pavement outside the Greenwich Observatory. 180 Longitude is in the Pacific Ocean and is known as the International Dateline. This is because,by international agreement, each day is considered to begin at the Dateline. before Standard Time was adopted, each geographic region kept its own idea of the time of day based on sunrise and sunset. The concept of "hours" did not really exist.

One very important instrument in keeping time is, of course, the chronometer (clock). Timekeeping was very important to sailing ships to determine their position and rate of progress in the vastness of the oceans. The British Navy stimulated the invention and improvement of timepieces by offering cash prizes to inventors.

Meridians of longitude; parallels of latitude. Remember that meridians are all the same length (20,000 km) and that they meet at the poles. Parallels are, well, parallel, and are different lengths, the longest being the Equator.