Which line represents longitude 0 degrees?

Which line represents longitude 0 degrees?

• A. Prime Meridian
• B. Equator
• C. International Date Line
• D. Tropic of Cancer

Answer: (A)

Longitude lines run north–south from pole to pole and measure how far east or west you are from a starting reference at 0 degrees. That starting reference is the Prime Meridian, which passes through Greenwich and serves as the global 0-degree line for longitude. The Equator is a 0-degree line, but for latitude, not longitude, and the Tropic of Cancer is a latitude line at about 23.5 degrees north. The International Date Line sits roughly opposite the Prime Meridian at 180 degrees longitude. So the line representing longitude 0 degrees is the Prime Meridian.

Longitude lines run north–south from pole to pole and measure how far east or west you are from a starting reference at 0 degrees. That starting reference is the Prime Meridian, which passes through Greenwich and serves as the global 0-degree line for longitude. The Equator is a 0-degree line, but for latitude, not longitude, and the Tropic of Cancer is a latitude line at about 23.5 degrees north. The International Date Line sits roughly opposite the Prime Meridian at 180 degrees longitude. So the line representing longitude 0 degrees is the Prime Meridian.