i learned several amazing geography facts today. here is one of them:
the earth isn't perfectly spherical. there's a bit of a bulge because of the centrifugal force of the earth's rotation (imagine pressing a tennis ball on a table, and you'll have a good idea of how it's shaped.) there's nothing on earth that's the shape of...well...the earth. so, some geographers decided to come up with a name for the earth's shape: geoidal. the definition of geoidal? earth-shaped. the earth? yeah. it's geoidal. yep, earth-shaped.
update: edited to enhance scientific accuracy.
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