How do the moon's & earth's orbital planes intersect?

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SUMMARY

The Earth's orbital plane, known as the ecliptic, intersects with the Moon's orbital plane at an inclination of approximately 5 degrees. These planes are neither parallel nor perpendicular; instead, they intersect at a variable angle that changes over time. The orientation of the Moon's orbit completes a full rotation every 18+ years, while the argument of perigee rotates every ~9 years. This dynamic relationship is crucial for understanding lunar phases and eclipses.

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  • Understanding of orbital mechanics
  • Familiarity with the concepts of ecliptic and orbital inclination
  • Knowledge of lunar phases and eclipses
  • Basic grasp of celestial navigation
NEXT STEPS
  • Research the effects of the Moon's orbital inclination on eclipses
  • Explore the concept of the argument of perigee in orbital dynamics
  • Learn about the long-term variations in the Moon's orbit
  • Investigate simulations of celestial mechanics using tools like Orbit Simulator
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Astronomers, astrophysicists, educators, and students interested in celestial mechanics and the dynamics of Earth-Moon interactions.

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Consider the Earth's orbit around the sun to be in a plane A and the moon's orbit around the Earth to be in a plane B. How do these planes intersect? Are they parallel or perpendicular? At what angle do they intersect themselves? Does the angle stay the same, or does it vary.
 
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The Moon's orbit is inclined roughly 5 degrees to the ecliptic. The ecliptic is defined to be the plane of the Earth's orbit. The orientation rotates one complete revolution every 18+ years. The argument of perigee rotates one complete revolution every ~9 years. Click the link for an animation. This is viewed from the ecliptic, so if it were shown, the Earth's orbital plane would be a horizontal line through the center of the Earth.

http://www.orbitsimulator.com/gravity/saros.GIF
 

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