prime meridian
Sign in to saveline of longitude, at which longitude is defined to be 0°
AI overview
The prime meridian is an imaginary line running around Earth where longitude is set at 0°, serving as the reference point from which all other longitudes are measured east and west. It matters because it provides a standardized way for people worldwide to specify locations on a map and coordinate activities that depend on knowing exact positions.
AI-generated from the Wikipedia summary — may contain errors.
Article
0°
Modern IERS Reference Meridian on Earth (interactive map)