Gyroscopic effect on planetary motion

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SUMMARY

The discussion centers on the gyroscopic effect and its relation to planetary motion, specifically Earth's rotation and revolution around the Sun. The original poster initially misunderstands the impact of gyroscopic effects on Earth's rotational axis but later acknowledges that the axis remains stable during its revolution. The conversation highlights the phenomenon of precession of the equinoxes, which occurs over a 26,000-year cycle, indicating that while Earth's axis does experience changes, it does not undergo immediate gyroscopic effects as initially thought.

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R Power
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Gyroscopic effect on planetary motion!

Hi PFians

This is my first ever post in astrophysics since I've got very interested in it from last 2 days...

I was wondering when Earth rotates about it's axis and at the same time changes it's direction due to revolution about sun...won't it have to handle gyroscopic effects. When a spinning object like a bicycle wheel is forced to change direction(while steering), it undergoes rotation about an axis perpendicular to the changed direction and hence the whole bicycle rotates (to counter this we lean the bicycle at an angle).
Similarly, when the spinning Earth will change its direction due to movement about sun, it will undergo rotation about an axis exactly perpendicular to rotational axis.
Correct me if I am wrong!
 
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Take a bicycle wheel in your hands and set it spinning. Now turn the wheel to the side. You will experience a force turning you around.

This is not how the Earth works.

Take a bicycle wheel in your hands and set it spinning. Now step forward, then left then back then right. You do not experience a force turning you around.

This is how the Earth works.
 


Take a bicycle wheel in your hands and set it spinning. Now step forward, then left then back then right. You do not experience a force turning you around.

This is how the Earth works.
Yeah! I got it wrong! Actually direction of Earth's rotational axis doesn't change!
But what about the precession of equinoxes (the Earth's wobbling). At that time the Earth's rotational axis gets changed... so then Earth must experience Gyroscopic effects!
 


R Power said:
But what about the precession of equinoxes (the Earth's wobbling). At that time the Earth's rotational axis gets changed... so then Earth must experience Gyroscopic effects!

Earth's precession occurs over 26,000 years. That's 75 years per 1 degree.
 

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