The hemisphere or half of a sphere that is opposite to a reference hemisphere, or the point directly opposite on a sphere.
From anti- (against) + hemisphere (hemi- half + sphere sphere). A geometric term used in mathematics and cartography to describe opposite sides of spherical objects.
Your antihemisphere on Earth is the exact opposite spot on the globe—if you dug straight down through Earth, you'd come out on your antihemisphere, which is how antipodal points work on maps.
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