That's the imaginary cricle comprised of the Prime Meridian
and the meridian of 180 degrees longitude.
The imaginary line that divides the earth into the northern and southern hemispheres is called Equator, the line that divides it into the eastern and western hemispheres is the prime meridian.
The imaginary line that divides Earth into the Northern and Southern Hemispheres is called the equator.
Prime Meridian
The imaginary line that divides the Earth into eastern and western hemispheres is the Prime Meridian, which runs through Greenwich, England. This line serves as the 0° line of longitude and separates the Eastern Hemisphere (to the east of the Prime Meridian) from the Western Hemisphere (to the west of the Prime Meridian).
Prime Meridian
The two imaginary lines that divide the Earth into hemispheres are the Equator, which divides the Earth into the Northern and Southern Hemispheres, and the Prime Meridian, which divides the Earth into the Eastern and Western Hemispheres.
The term used to describe this imaginary line is the Prime Meridian. It is located at 0 degrees longitude and runs from the North Pole to the South Pole, dividing the Earth into the Eastern Hemisphere and the Western Hemisphere.
The full circle formed by the Prime Meridian and the meridian of 180° longitude separates the eastern and western hemispheres.
The full circle formed by the Prime Meridian and the meridian of 180° longitude separates the eastern and western hemispheres.
The full circle formed by the Prime Meridian and the meridian of 180° longitude separates the eastern and western hemispheres.
The meridians of 0° and 180° longitude separate the eastern and western hemispheres.
The Prime Meridian divides the globe into Eastern and Western hemispheres, just as the equator divides the globe into Northern and Southern hemispheres.