# Binary planet eclipses

I know that on a binary planet you would have planetary eclipses (basically like a solar or lunar eclipse but with planets instead of moons).
If there also is a moon, things would be much more complicated.

With a binary planet and 1 moon you could get:

• Double lunar
• Lunar + solar
• Lunar
• Solar
• Double solar

And with the double eclipses you basically have these factoring in:

• Type (partial, penumbral (total but in penumbra), and total for lunar and partial, total, and annular for solar)
• Visibility from planet (both from 1 or 1 from each)
• Periodicity (how periodic the eclipses are - which I think would be almost or absolutely periodic in binary planets)

But would a lunar eclipse generally be visible from each planet and same for solar or would it vary a lot (taking the moon's path into consideration).

I think it would vary a lot since I think the moon would move in a figure 8 around the planets.

• You need to specify the orbital configuration of your planets and moons. A binary planet with two large planets and then a smaller moon orbiting the common center of gravity of both larger planets is probably the most likely setup. Commented May 9, 2016 at 11:06
• This should help you sort out the orbital path: en.wikipedia.org/wiki/Circumbinary_planet Commented May 9, 2016 at 11:32
• I think that this question I asked is related to yours, you just have to change up the distances and orbital periods. Commented May 9, 2016 at 14:17
• @Separatrix So basically I take the orbital paths of planets orbiting binary stars and scale it down by thousands or even millions to get the orbital path Commented May 10, 2016 at 3:36
• @Caters, it would certainly give you somewhere to start. I doubt you'd be able to work out a figure of eight orbit but there could be a stable one in there somewhere. Commented May 11, 2016 at 8:47