noun: a surface whose plane sections are all ellipses or circles ("The Earth is an ellipsoid")
adjective: in the form of an ellipse
James Clerk Maxwell
"9 coefficients determine the relationship between flux and intensity
6 of these coefficients form 3 pairs of equal quantities
3 pairs of equal coefficients will self-conjugate." [James Clerk Maxwell]
The original quote from "https://svpwiki.com/pdffiles/A_Treatise_on_Electricity_and_Magnetism.pdf - vol. I".
"The case in which the components of the flux are linear functions of those of the force is discussed in the chapter on the Equations of Conduction, Art. 296. There are in general nine coefficients which determine the relation between the force and the flux. In certain cases we have reason to believe that six of these coefficients form three pairs of equal quantities. In such cases the relation between the line of direction of the force and the normal plane of the flux is of the same kind as that between a diameter of an ellipsoid and its conjugate diametral plane. In Quaternion language, the one vector is said to be a linear and vector function of the other, and when there are three pairs of equal coefficients the function is said to be self-conjugate." [James Maxwell, A Treatise on Electricity and Magnetism - vol. I]
See Also
Apogee
Apsidal
eccentric orbit
9.24 - Elliptical Enharmonic Orbit
ellipse
ellipsoid
elliptic
elliptical orbit
spiral-ellipse
theory of elliptic functions
Equator
Fathom
Figure 9.7 - Two Centers Showing Complex Attraction Dynamics
Latitude
Longitude
Meridian Arc
off-center flywheel
Orbital Plane
Perigee
Prolate
Quantum Arithmetic Elements
Quantum Arithmetic
Sphere
two centers
two controlling points of stillness
two dividing poles
two lights of the spectrum
two opposed electric forces
two points of stillness
two poles
two-way compression-expansion sequence
two-way divided effects of motion
two-way effect
two-way extension of a point in space
two-way motion
two-way opening and closing universe
two-way universe
12.38 - Orbital revolution
9.23 - Circular Harmonic Orbit
9.24 - Elliptical Enharmonic Orbit