Hemisferat
Hemisferat refers to the two halves of a sphere. This term is most commonly used in geography to describe the Earth's division into the Northern Hemisphere and the Southern Hemisphere, or the Eastern Hemisphere and the Western Hemisphere. The equator divides the Earth into the Northern and Southern Hemispheres, while the Prime Meridian and the 180th meridian divide it into the Eastern and Western Hemispheres.
In astronomy, hemisferat can refer to halves of celestial bodies, such as the Moon or other planets.
The term can also be used more generally in mathematics and geometry to describe half of any