Who discovered the International Date Line?

Question

If no one discovered it who made it? Or used it first?

Answer 1

sailor have long known that they had to adjust their clocks...going from east to west they need to set their clocks back 1 hour every 15 degrees of longitude and and going west to east just the reverse.

If you go completely around the earth setting your clock back an hour at the appropriate place you will have lost a day.

The first people to really encounter this problem in the real world were the people on Magelleans ship (first to sail around the world)  Arriving back in Europe they discovered that the date was Thursday July 10 , 1522 when the ships log said it was Wednesday July 9, 1522. They had lost a day....

later an international conference established the international date line approximately in the center of the pacific ocean where the time changes by one day as you cross the line in a ship or plane.  This could be a long mathematical topic and t here are may sources...google "international date line"

Answer 2

Grandfather Time, on a holiday to Fiji.

Answer 3

No one "discovered" it. It's not a natural phenomenon. It's an arbitrary line on the globe that is drawn where it is simply because it is 180 degrees of longitude from Greenwich in the UK.

TV

Answer 4

it wasn't discovered, it was created in order to help us humans make sence of days and know when we are.

Answer 5

The need for it was established when Magellen's crew returned to Spain in 1522. Upon returning they found their calendars were a day behind, even though they had faithfully maintained the ship's log. However, they did not have clocks accurate enough to observe the very slight lengthening of each day during which they were underway on the journey (and since they traveled west, after circumnavigation they had rotated about the earth's axis exactly one fewer times, hence experiencing one fewer night, than if they had remained in Spain).

Answer 6

Arthur Date and Robert Line.  Actually, it's a mathematical fiction which would have to be placed at some point in the world in order to mark the imaginary border between the Eastern and Western hemisphere.  It really is completely arbitrary and does not exist in any real sense other then in the way Europeans have chosen to organise space and time.