Planets & Moons Orbit: Earth, Uranus, Neptune, Jupiter, Mars, Pluto, etc.

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    Moon Orbit Planets
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SUMMARY

The discussion focuses on the orbital dynamics of moons and rings around various planets, specifically addressing the unique behavior of Earth's moon and its nodes during the saros cycle. It highlights that moons and rings typically revolve around their planets' equators, yet Earth's moon exhibits a complex relationship with its axis, leading to questions about the possibility of moons orbiting at angles relative to their planets. The conversation also touches on the gravitational influences of the Sun on moons within a planet's Hill sphere, particularly those of giant planets like Jupiter and Saturn, which can have moons with varied inclinations.

PREREQUISITES
  • Understanding of celestial mechanics and orbital dynamics
  • Familiarity with the concept of the Hill sphere
  • Knowledge of the saros cycle and lunar nodes
  • Basic principles of gravitational interactions in multi-body systems
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  • Research the mechanics of lunar nodes and the saros cycle
  • Explore the concept of the Hill sphere and its implications for moon stability
  • Study the gravitational effects of the Sun on planetary moons
  • Investigate the orbital characteristics of irregular moons around giant planets
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Astronomers, astrophysicists, and students of planetary science interested in the dynamics of moons and rings in relation to their parent planets.

Super**Nova
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Uranus, Neptune, Jupiter, Mars, Pluto, etc.--each of them has either moons or rings. Both rings and moons revolve around their equators regardless of the planets' axis. What concerns me is that while Earth's moon also revolves around the axis of Earth, why is it that during the saros, the moon has gradually switched ascending and descending nodes? Doesn't the moon's revolutionary path become perpendicular to Earth's axis instead of parallel with it? It seems very contradictory to any other moon or ring.

Given that, what I want to know, is it possible for a perfectly upright planet with no axis to have a moon that revolves on an axis anyway? Or, moons that don't necessarily revolve evenly along a planet's equator, above or below it? I mean, if you look at Pluto, it revolves around the sun on an axis, whereas the other planets revolve along the sun's center. Can the same apply to moons or rings? Would that be possible if the planet grabbed materials in its gravitational field at an angle, formed a moon that way, and it just happens to revolve at the eccentric angle the planet grabbed it from?
 
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The Moon's orbit is about 1/3 of the way to the edge of Earth's Hill sphere. This is very far compared to the other major moons in the solar system. Consequently, the perturbation on the Moon by the Sun is quite strong. But the giant planets also have a vast collection of small moons that orbit 1/3 of the way or more to the edge of their planet's Hill sphere. The Sun stronly perturbs them too. They are not bound to their planet's equator, but orbit in a wide range of inclinations.
 

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