Question

I want to know about International Date line

Answer 1

what is international date line:

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. When you cross the IDL, the day and date change. If you cross it traveling westward, the day goes forward by one, and the date increases by one. If you cross it traveling eastward, the opposite occurs.

main hand behind IDL:

During the Age of Discovery, beginning in the 15th century, cartographers saw the need for standardized latitude and longitude measurement. If your intent is to map or claim a geographic location, you need to describe its position unambiguously. Britain "ruled the waves" at the time, and took the early lead in this endeavor.

Portugal and Spain, the other major seafaring nations, were using their own systems, but eventually deferred to England. Latitude was less an issue than longitude, since there was no dispute about where the poles (latitude 90 degrees north and 90 degrees south) and equator (latitude 0 degrees) were located. However, the selection of a starting point for longitude measurement (the 0-degree meridian) was arbitrary. It was based more on national pride and convenience.

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