A half of a sphere, especially one of the halves into which the earth is divided. The Northern Hemisphere experiences winter while the Southern Hemisphere enjoys summer.
The cerebral hemisphere, one of the two halves of the brain. The left hemisphere of the brain is typically associated with logical reasoning and analytical tasks.
Either half of the celestial sphere as divided by the celestial equator, the ecliptic, or the horizon. Observers in the southern celestial hemisphere can see constellations that never rise above the northern horizon.