Definition:Terrestrial Hemisphere
Definition
Northern Hemisphere
The northern hemisphere of Earth is the hemisphere between the equator and the North Pole.
Points in the northern hemisphere have latitude between $0 \degrees \, \mathrm N$ (the equator itself) and $90 \degrees \, \mathrm N$ (the North Pole).
Southern Hemisphere
The southern hemisphere of Earth is the hemisphere between the equator and the South Pole.
Points in the southern hemisphere have latitude between $0 \degrees \, \mathrm S$ (the equator itself) and $90 \degrees \, \mathrm S$ (the South Pole).
Eastern Hemisphere
The eastern hemisphere of Earth is the hemisphere immediately to the east of the principal meridian.
Points in the eastern hemisphere have longitude between $0 \degrees \, \mathrm E$ (the principal meridian itself) and $180 \degrees \, \mathrm E$.
Western Hemisphere
The western hemisphere of Earth is the hemisphere immediately to the west of the principal meridian.
Points in the western hemisphere have longitude between $0 \degrees \, \mathrm W$ (the principal meridian itself) and $180 \degrees \, \mathrm W$.