oblateness
Equatorial bulge measure
Oblateness is the quality of being flattened at the poles, like a sphere that's been slightly squished.
The term appears most often in astronomy and physics, describing planets and stars that bulge at the equator due to rotation: Earth's oblateness is slight but measurable.
The opposite quality—elongation along the polar axis—is prolateness.
Nearly round solid
- ellipsoidOval solid shape
- bulgeOutward curved projection
- equatorialOf Earth's central line
- polarOf extreme latitudes
flattening · rotation · centrifugal · Jupiter · Saturn · Earth · Neptune · Uranus
Nearly round solid
- ellipsoidOval solid shape
- eccentricityUnconventional behavior or nature
- flatteningReducing to evenness
- curvatureDeviation from flatness
asymmetry · prolate · diameter · circumference · distortion · volume · surface area · aspect ratio
Oval solid shape
- geoidGravitational equipotential surface model
- WGS84Earth's shape model
- gravimetryMeasuring gravitational field strength
- spheroidNearly round solid
geocentric · geospatial · geophysical · surveying · cartography · mapping
Made smooth or level
- squashedCrushed by force
- compressedReduced by pressure
- bulgingSwelling outward visibly
- disc-shapedCircular and flat
elliptical · oval · deformed · distorted · lenticular · discoid
spheroid
Nearly round solid
- ellipsoidOval solid shape
- bulgeOutward curved projection
- equatorialOf Earth's central line
polar · flattening · rotation · centrifugal · Jupiter · Saturn · Earth · Neptune · Uranus · axis
spheroid
Nearly round solid
- ellipsoidOval solid shape
- eccentricityUnconventional behavior or nature
- flatteningReducing to evenness
curvature · asymmetry · prolate · diameter · circumference · distortion · volume · surface area · aspect ratio · roundness
ellipsoid
Oval solid shape
- geoidGravitational equipotential surface model
- WGS84Earth's shape model
- gravimetryMeasuring gravitational field strength
spheroid · geocentric · geospatial · geophysical · surveying · cartography · mapping
flattened
Made smooth or level
- squashedCrushed by force
- compressedReduced by pressure
- bulgingSwelling outward visibly
disc-shaped · elliptical · oval · deformed · distorted · lenticular · discoid