There are 2: The Equator & the Prime (Greenwich) Meridian.
The Equator
The Equator
All parallels, or latitudes, cross 0 degrees longitude. 0 degrees longitude is the prime meridian. 0 degrees latitude, or parallel, is the equator
The Prime Meridian, it is located at 0 degrees latitude.
The parallel at 0 degrees latitude is called the Equator.
The 0 degrees is the planet Earth equator. The 50 degrees is the parallel [geographic latitude] that crosses several countries but the most importand is Belgium where the capital of EU is located
The parallel circling the globe at 0 degrees latitude is called the Equator. It divides the Earth into the Northern and Southern Hemispheres.
the prime meridian
The equator is located at 0 degrees latitude. The angle of latitude starts at 0 at the equator and ends with +90 and -90 degrees at the North and South poles, respectively. Lines of latitude are parallel to each other.
The Equator is the parallel that divides the Earth into two equal halves - the Northern Hemisphere and the Southern Hemisphere. It is located at 0 degrees latitude.
The lines of latitude, which run parallel to the equator, are referred to as parallels. They are used to measure the distance north or south of the equator in degrees. Each parallel is designated by its latitude, with the equator at 0 degrees and the poles at 90 degrees north and south.
Equator is the longest parallel on the Earth's surface. It divides the Earth into the Northern Hemisphere and the Southern Hemisphere and is located at 0 degrees latitude.