generated at
flattening
Earth flattening
Eccentricity (mathematics) § Ellipses
Equatorial bulge
Ovality
Planetary flattening
Sphericity
Roundness (object)

googleflattening
Google画像検索flattening
Google定義検索 flattening
wikipediaflattening
weblio flattening
kotobank flattening
jisho flattening