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Tychonic system

[tahy-kon-ik]

noun Astronomy.

a model for planetary motion devised by Tycho Brahe in which the earth is stationary and at the center of the planetary system, the sun and moon revolve around the earth, and the other planets revolve around the sun.

Origin:
1670–80; Tychon- (stem of Tycho (Brahe), Latinized form of Danish Tyge) + -ic

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Tychonic system is always a great word to know.

So is absolute magnitude. Does it mean:

the magnitude of a star as it would appear to a hypothetical observer at a distance of 10 parsecs or 32.6 light-years

a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space

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Tychonic system

Ty·chon·ic sys·tem