What is the prime meridan?

Answer 1

The Prime Meridian is themeridian (line of longitude) at which longitude is defined to be 0°.The Prime Meridian and the opposite 180th meridian (at 180° longitude), which the International Date Line generally follows, form a great circle that divides the Earth into the Eastern and Western Hemispheres.Unlike the parallels of latitude, which are defined by the rotational axis of the Earth (the poles being 90° and the equator 0°), the Prime Meridian is arbitrary. By international convention, the modern Prime Meridian passes through the Royal Observatory, Greenwich, in east London, United Kingdom, known as the International Meridian or Greenwich Meridian.Historically, various meridians have been used, including four different ones through Greenwich.By. Rashawn Bernard Hammond Louisiana