Question

on 0degree longitude, it will be on
If it is midnight
IDL.
am​

Answer 1

Answer:

Explanation:

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.

'Does anybody really know what time it is?'

Back in the days before mechanical clocks, time was measured mostly using sundials. People relied on the definition that "noon" was when the sun was highest in the sky, and due south. One "day" was simply the amount of time between two consecutive "noons." Most cities on the planet set their clocks to that cycle, and all was good — at least within any specific city.

 

The problem was, each city experienced noon at its own (apparent) 12:00 p.m. Depending on longitude, adjacent cities could have a time of, say, 11:45 a.m. or 12:15 p.m. displayed on their sundials. Near the equator, traveling westward by about 1,000 miles (1,600 kilometers) delays the arrival of noon by one hour.

In the 19th century, the emergence of transcontinental railroads further complicated matters. That century also saw accurate mechanical timepieces becoming widely available. Travelers found themselves resetting their watches by several minutes at every station to the east or west. This was inconvenient at best.

The telephone, patented in 1876 by Alexander Graham Bell, was the second such IM system. And of course, to use either system effectively, it's helpful to know the clock times at both the sender's and receiver's locations.