Here is the link to my planet orbit project:

http://scratch.mit.edu/projects/embed/23456990/

The program creates a stable orbit by calculating the initial velocity needed for a stable orbit and then makes the planet start at that velocity.

I found the equation of the orbit using the vis viva equation for orbital energy and I also used my knowledge about the mathematics of ellipses.

The hardest part of this project was turning the mathematical equations into animations on the screen and I had to change the velocity of the Earth at every point along its orbit.

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