-
A day is added when one crosses
-
- the equator from south to north
- 180 degree longitude from east to west
- the equator from north to south
- 180 degree longitude from west to east
- the equator from south to north
Correct Option: A
A traveler crossing the International Date Line eastbound subtracts one day, or 24 hours, so that the calendar date to the west of the line is repeated. Crossing the IDL westbound results in 24 hours being added, advancing the calendar date by one day. The International Date Line is necessary to have a fixed, albeit arbitrary, boundary on the globe where the calendar date advances in the westbound direction.
