FILE No.172Unsolved
When traveling around the world by plane, is it possible to experience the same date twice?
If you get stuck, open the hints one at a time, in order.
What is the date line for?
How does the date change going east versus going west?
In which direction do you experience the same date twice?
When traveling around the world by plane, is it possible to experience the same date twice?
Choose the answer closest to the truth.
Yes. Crossing the International Date Line eastward sets the date back one day
The answer is "Yes. Crossing the International Date Line eastward sets the date back one day."
Crossing the date line from west to east sets the date back by one day. For example, if you cross it at noon on the 10th, it becomes noon on the 9th again, and you experience the same date twice.
When crossing westward, the date moves forward by one day. Setting back a clock does not change the date.
Because you assume a date comes only once.
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