Question

Why is the IDL considered with respect to the 180° meridian only?

Answer 1

Drawn up in 1884. The 180° meridian was selected as the International Date Line because it mostly runs through the sparsely populated Central Pacific Ocean. It was decided at the International Meridian Conference in 1884 in Washington, D.C. where 26 countries attended.

Answer 2

1. Meridians of 180° reach after 12 hrs from prime meridians if one goes from east to west.
2. According to convection the start of the date at 180° is considered.
Therefore,.............