5-Astronomy-Solar System-Orbit-System
epicycle
In ancient theories of Earth-centered universe, orbits were circles and circles of circles {epicycle} {epicycle construction} {eccentric construction}.
geocentric system
Perhaps, Earth is near solar-system center {geocentric system}.
heliocentric system
Sun is near solar-system center {heliocentric system}.
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5-Astronomy-Solar System-Orbit
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Date Modified: 2022.0225