Hard time grasping the concept of the Geodesic

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SUMMARY

The discussion centers on calculating the trajectory of a small asteroid entering Earth's gravitational field using Newton's law of gravitation. The user highlights the complexity of the calculations due to the variation of gravitational acceleration (g) with distance, expressed as g = GM/(2r^2). The challenge lies in applying projectile motion principles at significant distances where gravitational forces differ from standard assumptions. Suggestions for tackling this problem are sought, particularly in relation to advanced calculus and tensor applications.

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  • Understanding of gravitational fields
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Have a hard time grasping the concept of the Geodesic. If you are given a velocity and position of say a small astroid entering the gravitational field of the Earth. How do you find the trajectory or path it takes as it falls to Earth? Not afraid of tensors and advanced calculus.
 
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You find the trajectory using Newton's law of gravitation.
 


I am trying to do this by sort of projectile motion but at greater distances from the Earth g varies by a factor of:

g = GM/(2r^2) making that calculation difficult. Any suggestions?
 

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