# Why is a day lose when crossing the international date line from west to east?

## Why is a day lose when crossing the international date line from west to east?

The prime meridian is also where the system of 24-hour timekeeping that is called Greenwich Mean Time (GMT) originated. As you go east from the prime meridian, the time zones increase consecutively by one hour, or conversely, decrease consecutively by one hour as you go west.

## When crossing the international date line traveling from west to east do you lose a day or gain a day?

Thus, the 180-degree line of longitude, exactly one-half way around the planet from Greenwich, England (at 0 degrees longitude), is approximately where the international date line is located. Cross the line from the east to the west, and you gain a day.

## What is the effect of crossing the international date line from west to east?

Answer: The International Date Line runs down the middle of the Pacific Ocean. If you cross the date line moving east, you subtract a day, whereas if you are moving west you add a day. For example, if today is Friday and we crossed the International Date line from west to east then it would be Thursday.

## Why do countries adjust the international date line?

The reason for this effect is that the countries on the western side of the International Date Line, (in or outside eastern Asia) have the time zone 10–12 hours more than Greenwich. So when travelling across the line, one’s watch has to be adjusted 20–24 hours, depending on the time zones.

## Where is international date line in Globe?

The International Date Line, established in 1884, passes through the mid-Pacific Ocean and roughly follows a 180 degrees longitude north-south line on the Earth. It is located halfway round the world from the prime meridian—the zero degrees longitude established in Greenwich, England, in 1852.

54.6 miles

## How do you calculate longitude?

The Earth rotates one full turn (360º of longitude) in one day. It therefore turns one degree of longitude in 1/360th of a day, or every four minutes. To calculate your longitude, you therefore simply need to work out the time difference between noon at your location and noon at the Prime Meridian.

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