epicycle
e
ˈɛ
e
pi
pÉĒ
pi
cy
ˌsaÉĒ
sai
cle
kəl
kēl
/ˈɛpÉĒsˌaÉĒkəl/

āχāĻ‚āϰ⧇āϜāĻŋāϤ⧇ "epicycle"āĻāϰ āϏāĻ‚āĻœā§āĻžāĻž āĻ“ āĻ…āĻ°ā§āĻĨ

01

āĻāĻĒāĻŋāϏāĻžāχāϕ⧇āϞ, āĻĻā§āĻŦāĻŋāϤ⧀āϝāĻŧ āĻŦ⧃āĻ¤ā§āϤāĻžāĻ•āĻžāϰ āĻ•āĻ•ā§āώāĻĒāĻĨ

(astronomy) a secondary circular orbit embedded within a primary circular orbit
āωāĻĻāĻžāĻšāϰāĻŖ
Copernicus disagreed with the Ptolemaic model adding unnecessary epicycles, believing instead that planets revolve in simpler circular orbits around the Sun.
āϕ⧋āĻĒāĻžāĻ°ā§āύāĻŋāĻ•āĻžāϏ āĻ…āĻĒā§āϰāϝāĻŧā§‹āϜāύ⧀āϝāĻŧ āĻāĻĒāĻŋāϏāĻžāχāϕ⧇āϞ āϝ⧋āĻ— āĻ•āϰ⧇ āϟāϞ⧇āĻŽāĻŋāĻ• āĻŽāĻĄā§‡āϞ⧇āϰ āϏāĻžāĻĨ⧇ āĻāĻ•āĻŽāϤ āĻšāύāύāĻŋ, āĻŦāϰāĻ‚ āĻŦāĻŋāĻļā§āĻŦāĻžāϏ āĻ•āϰāϤ⧇āύ āϝ⧇ āĻ—ā§āϰāĻšāϗ⧁āϞāĻŋ āϏ⧂āĻ°ā§āϝ⧇āϰ āϚāĻžāϰāĻĒāĻžāĻļ⧇ āϏāϰāϞ āĻŦ⧃āĻ¤ā§āϤāĻžāĻ•āĻžāϰ āĻ•āĻ•ā§āώāĻĒāĻĨ⧇ āĻ˜ā§‹āϰ⧇āĨ¤
02

āĻāĻĒāĻŋāϏāĻžāχāϕ⧇āϞ, āĻ—ā§ŒāĻŖ āĻŦ⧃āĻ¤ā§āϤ

a small circle whose center moves around the circumference of a larger circle
āωāĻĻāĻžāĻšāϰāĻŖ
The motion of a point on an epicycle can be described mathematically by combining the rotations of the smaller circle and the larger circle.
āĻāĻ•āϟāĻŋ āĻāĻĒāĻŋāϏāĻžāχāϕ⧇āϞ āĻāϰ āωāĻĒāϰ āĻāĻ•āϟāĻŋ āĻŦāĻŋāĻ¨ā§āĻĻ⧁āϰ āĻ—āϤāĻŋ āĻ—āĻžāĻŖāĻŋāϤāĻŋāĻ•āĻ­āĻžāĻŦ⧇ āĻŦāĻ°ā§āĻŖāύāĻž āĻ•āϰāĻž āϝ⧇āϤ⧇ āĻĒāĻžāϰ⧇ āϛ⧋āϟ āĻŦ⧃āĻ¤ā§āϤ āĻāĻŦāĻ‚ āĻŦāĻĄāĻŧ āĻŦ⧃āĻ¤ā§āϤ⧇āϰ āĻ˜ā§‚āĻ°ā§āĻŖāύāϗ⧁āϞāĻŋāϕ⧇ āĻāĻ•āĻ¤ā§āϰāĻŋāϤ āĻ•āϰ⧇āĨ¤
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āύāĻŋāĻ•āϟāĻŦāĻ°ā§āϤ⧀ āĻļāĻŦā§āĻĻ
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āĻ…ā§āϝāĻžāĻĒ āĻĄāĻžāωāύāϞ⧋āĻĄ āĻ•āϰ⧁āύ