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14 votes

On a planet with 6 moons, how often would all 6 be full at the same time?

If they are ever all full at once, and if their orbits are stable, then the time between such grand syzygies is the least common multiple of their periods: 9120 days. Note that the periods of Io, ...
Anton Sherwood's user avatar
12 votes

On a planet with 6 moons, how often would all 6 be full at the same time?

If your moons have quasi-circular orbits, it implies that the two moons with the same period are on the same orbit by Kepler’s 3rd law, or at least that one is on a Lagrange point of the other. Only ...
Didier L's user avatar
  • 229
5 votes
Accepted

Lagrange Points regarding a moon 1.5 times the mass of Earth's Moon and one 0.75 times the mass of Earth's Moon

I want these two moons to have the same orbital period/lunar month--as in, it takes them each thirty days to complete their cycle. With their specified masses, this is not possible. If Thoth was a ...
John Dallman's user avatar
  • 24.6k
4 votes

On a planet with 6 moons, how often would all 6 be full at the same time?

This depends, to some extent, on what you mean by "cycles/orbital periods". If you're referring to the time between successive "full moons" on each satellite, then Anton Sherwood's ...
Someone Else 37's user avatar
4 votes

Space Cold/hot War with periodical cycles

Objects orbiting the sun at different speeds but with similar orbits will spend most of their time at a considerable distance from each other, but for a short period of time they will pass very close. ...
MarcoMarksman's user avatar
3 votes
Accepted

Space Cold/hot War with periodical cycles

Elliptical Orbits Image courtesy Terraforming Wiki. This is easily solved using elliptical orbits. If a circular orbit is defined as axis A = axis B, then an elliptical orbit is defined as axis A > ...
JBH's user avatar
  • 126k
3 votes
Accepted

At what rate does my planet become tidally locked?

There is an equation to find the time taken for a satellite to become tidally locked. I believe it can be rearranged to make a function to show how day length will change over time. $$t = \frac{wa^6IQ}...
Valitenci's user avatar
  • 508
3 votes

Would it be possible for a somewhat distant bianary star system to have a planet orbiting their barycenter within both their orbits?

Approximating a distribution of masses with their barycenter only works when "sufficiently away" from said masses. Being between those two masses doesn't qualify as "sufficiently away&...
L.Dutch's user avatar
  • 291k
1 vote

On a planet with 6 moons, how often would all 6 be full at the same time?

Their least common denominator is: $$12=2^2\cdot 3$$ $$20=2^2\cdot 5$$ $$24=2^3\cdot 3$$ $$32=2^5$$ $$38=2\cdot 19$$ So the least common denominator is $$2^5\cdot 3 \cdot 5 \cdot 19 = \underline{\...
Gray Sheep's user avatar
  • 3,931
1 vote

Would it be possible for a somewhat distant bianary star system to have a planet orbiting their barycenter within both their orbits?

No, but something else might be As has been mentioned, the barycenter of two bodies is used to approximate the effects they both have on something. It is only accurate over long distances, and being ...
Bubbles's user avatar
  • 1,791
1 vote

Space Cold/hot War with periodical cycles

There's really only three ways to not get what you want - 1) the two ships are in the exact same orbit and are constantly near each other; 2) the ships' orbits don't intersect and they are never near ...
Nuclear Hoagie's user avatar
1 vote

How do Hill spheres work for binary planets?

Hill spheres define the area surrounding a celestial body in which it can exert gravitational dominance over the orbit of a satellite. In the case of binary planets, where two planets revolve around a ...
Digital's user avatar
  • 21

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