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------------------------------------------------ What happens when you are headed west and you travel 180 degrees across the International Date Line?

A. You gain a day
B. You lose a day
C. Your calendar remains the same
D. You skip a day

If you're headed WEST and travel 180 degrees across the International Date Line, you gain a day. The line, placed mainly over water bodies, adjusts the date in order to maintain a rational system of timekeeping on our rotating planet.

Explanation:

Travelling Across the International Date Line:

When you're travelling WEST and you cross the International Date Line, which is approximately along the 180° meridian of longitude, you gain a day. The establishment of the International Date Line is based on international agreement to address timekeeping issues that result from the rotation of our planet. It's premise is to ensure that neighbouring regions do not function on different dates. Placed predominantly over water bodies, it makes adjustments in a few places like in Alaska and some island groups, so as not to disrupt local timekeeping. For instance, if you're travelling from east to west, you would set your calendar forward by one day.

To put this into a real-world context, the bombing of Pearl Harbor in Hawaii was on a Sunday, December 7, 1941 according to United States' calendar. However, due to crossing the International Date Line, in Japan, this incident is taught as having occurred on Monday, December 8.

Learn more about International Date Line here:

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