Challenge: Create an Earth Orbit Frame of Reference
You can do this. Just follow the steps that we took for the moon:
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Create a 3D object to hold Earth, and add it to the sun.
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Add Earth to the new orbit frame of reference instead of the scene.
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Delete the animate code that sets Earth’s position.
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Rotate Earth’s orbit.
Once you do that, you have a very complex astronomical simulation that is built using nothing but simple frame of reference—no complicated sines or cosines anywhere!
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