I posted a pendulum video a while back, right about the same time another movie was getting some exposure, and the latter has gotten a lot of attention on the blogohedron because it’s like, all professionally done, if you like that sort of thing. And my pocket-camera-video tryingtodoitallonmyownwithoutatripod effort came up a bit short (by a factor of about 20,000 so far)

Anyway, I see that some math has appeared: Wave Pendulum Analysis