The revolution of moon being considered to take place with constant speed, it lacks constant velocity.
The speed is the distance covered by an object in unit time. It is a scalar quantity and thereby is not affected with the change in direction.
The velocity is also given as the distance travelled per unit time. But it is a vector quantity, and change with the change in the direction.
The orbit of moon around the earth is with the constant speed, while in covering the oval path there is the change in the direction. Thus, the revolution of the moon did not the constant velocity.
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