flattening

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flattening

geodesy

Also known as: polar flattening

Learn about this topic in these articles:

measurement of Earth

In geoid
Flattening (f) is defined as the difference in magnitude between the semimajor axis (a) and the semiminor axis (b) divided by the semimajor axis, or f = (a − b)/a. For Earth the semimajor axis and semiminor axis differ by about 21 kilometres (13 miles),…
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