Why are space crafts usually launched from west to east?

Why are space crafts usually launched from west to east? Why is it more advantageous to launch rockets in the equatorial plane?

Ans.     Earth rotates on its axis from west to east. A satellite launched from west to east will have the advantage of the additional velocity of the earth’s rotation. The effect is maximum  at the equator, hence it is most advantageous to launch the satellite from west to east on the equatorial plane.

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