rotation, precession and nutation

S.mutans

Rotation (green), precession (blue) and nutation in obliquity (red) of a planet

Yearly changes in the location of the Tropic of Cancer near a highway in Mexico
墨西哥每年夏至頭殼頂太陽的位置


Earth's Orbit Eccentricity Precession, Last Million Years
^http://youtu.be/hajMQpLv-YA

Earth's motion around the Sun, not as simple as I thought
^http://youtu.be/82p-DYgGFjI

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gravity simulations

Gravity Simulation
^http://youtu.be/ztwkXq4Hj7Q

Stable Figure-of-Eight 3-Body Orbit
^http://youtu.be/jKvnn1r-9Iw

3-Body Lagrange Problem With Osculating Orbits
^http://youtu.be/m689l0sjMmE

4-Body Lagrange Problem With Osculating Orbits
^http://youtu.be/BG0Oi1muq_0

3 Body problem: A stable binary system
^http://youtu.be/bbWz-8b5FmQ

Numerical Simulation of 5-body Problem
^http://youtu.be/3fxYwo8wt9A