http://en.wikipedia.org/wiki/Eclipse_cycle
It, of course, doesn't apply to eclipses of third objects (really occultations, I'd suppose).
I should have thought that through all the way.
Anyway, here's a cool pic of a lunar eclipse in time lapse from the wiki:
![](http://upload.wikimedia.org/wikipedia/commons/0/0b/Lunar-eclipse-2004.jpg)
Leave a comment