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I've been trying to make a basic animation which involves launching a spaceship from one planet to another. Both planets orbit at different rates from the star with fixed speeds.

The spaceship also has a fixed speed from start to finish.

What i don't understand is how you measure how long it takes given both the destination is moving and the spaceship has to "curve" around and not just going a completely straight line.

My animation is here if you are curious to see it in action: http://jsfiddle.net/5Mx2t/

I don't know how to actually work out the correct maths for it! I have all kinds of problems with my animation attempt, such as the ship travelling faster if the planets are closer.

Note: gravitational pull is not taken into account as im not going quite that far with realism.

So yeah some help explaining how i would work this out would be very helpful! :)

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# Completely confused with orbiting planets maths

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