極きょく半はん径けい

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Meanings

1

noun

polar radius

astronomy

Technical term in astronomy and geodesy; the distance from the center of a celestial body to its pole.

extreme, pole, extremely

半half, middle, odd number

径diameter, path, method

赤せき道どう半はん径けい
Equatorial radius; the distance from the center to the equator, which is larger than the polar radius for oblate spheroids like Earth.

Compound of 極 (pole) and 半径 (radius).