What geographic line marks the boundary where the calendar day changes (the line used for date changes)?

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Multiple Choice

What geographic line marks the boundary where the calendar day changes (the line used for date changes)?

Explanation:
The International Date Line is the boundary where the calendar day changes. It sits roughly along the 180th meridian in the Pacific Ocean, opposite the Prime Meridian. Crossing it shifts the date by one day—going west across the line you add a day, going east you subtract a day—so that local dates stay in sync with the progression of days around the world. The Prime Meridian is the 0 longitude line, the Equator is 0 latitude, and the Tropic of Cancer is a specific latitude about 23.5 degrees north.

The International Date Line is the boundary where the calendar day changes. It sits roughly along the 180th meridian in the Pacific Ocean, opposite the Prime Meridian. Crossing it shifts the date by one day—going west across the line you add a day, going east you subtract a day—so that local dates stay in sync with the progression of days around the world. The Prime Meridian is the 0 longitude line, the Equator is 0 latitude, and the Tropic of Cancer is a specific latitude about 23.5 degrees north.

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