Whats special about East

Classical Mechanics Level 2

Why is it all the rockets are fired in the eastward direction?

So that the rotation of earth, which is from west to east, would impart some velocity on the rocket, for free of cost.

Is this explanation true or false?

Pic credit : http://spaceplace.nasa.gov/review/launch-windows/launchdiagram_anim.en.gif.

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