het·er·o·ge·ne·ous
adjective
diverse in character or content.
"a large and heterogeneous collection"
Similar:
diverse
diversified
varied
varying
miscellaneous
assorted
mixed
sundry
contrasting
disparate
different
differing
divergent
unrelated
variegated
wide-ranging
motley
divers
myriad
legion
contrastive
Opposite:
homogeneous
CHEMISTRY
of or denoting a process involving substances in different phases (solid, liquid, or gaseous).
"heterogeneous catalysis"
MATHEMATICS
incommensurable through being of different kinds, degrees, or dimensions.
au·tar·ky
noun
economic independence or self-sufficiency.
"rural community autarchy is a Utopian dream"
a country, state, or society which is economically independent.
plural noun: autarkies; plural noun: autarchies
(astronomy)
In astronomy, perturbation is the complex motion of a massive body subjected to forces other than the gravitational attraction of a single other massive body.[1] The other forces can include a third (fourth, fifth, etc.) body, resistance, as from an atmosphere, and the off-center attraction of an oblate or otherwise misshapen body.[2]
The perturbing forces of the Sun on the Moon at two places in its orbit. The blue arrows represent the direction and magnitude of the gravitational force on the Earth. Applying this to both the Earth's and the Moon's position does not disturb the positions relative to each other. When it is subtracted from the force on the Moon (black arrows), what is left is the perturbing force (red arrows) on the Moon relative to the Earth. Because the perturbing force is different in direction and magnitude on opposite sides of the orbit, it produces a change in the shape of the orbit.
(File that one away. Its gonna come back up again when I/we get around to the bit about
Sept 23rd, 2017.)
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