Ellipsoid (disambiguation)

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Ellipsoid may refer to:

• Ellipsoid, a three-dimensional geometrical shape.
• Ellipsoidal coordinates.

Geodesy

• Earth ellipsoid, a mathematical figure approximating the shape of the Earth.
• Reference ellipsoid, a mathematical figure approximating the shape planetary bodies in general.
• Hayford ellipsoid

Mechanics

• Poinsot's ellipsoid, a geometrical method for visualizing the torque-free motion of a rotating rigid body.
• Lame's stress ellipsoid, an alternative to Mohr's circle for the graphical representation of the stress state at a point.
• Manipulability ellipsoid, used to describe a robot's freedom of motion.

Crystallography

• Index ellipsoid, a diagram of an ellipsoid that depicts the orientation and relative magnitude of refractive indices in a crystal.
• Thermal ellipsoid, ellipsoids used in crystallography to indicate the magnitudes and directions of the thermal vibration of atoms in crystal structures.

Lighting

• Ellipsoidal reflector floodlight
• Ellipsoidal reflector spotlight