Mean-Motion Resonance ·
Laplace 1:2:4
un
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.com · Io · Europa · Ganymede · integer period lock
Period ratio
1 : 2 : 4
Laplace angle
φ ≈ 180°
State
—
Io · P = 1.77 d
Europa · P = 3.55 d
Ganymede · P = 7.15 d
Conjunction / resonant angle
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.com · Mean-Motion Resonance