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Its speed is not always constant; because of its orbit, it sometimes goes faster or slower. However, its appearance changes because of where it is compared to the earth and sun - when the sun shines on part of it, that part is visible, but where it is in shadow, it is not visible.

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14y ago
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13y ago

The Moon's orbit is an ellipse, sort of an oval. It is basic orbital mechanics that when the satellite (in this case, the Moon) is closest to the primary (in this case, the Earth) it is moving fastest. This point of closest approach is called "perigee". As the Moon continues in its orbit, it is getting further away and slowing down, until it reaches "apogee", its furthest distance, and it begins to move closer and speed up.

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12y ago

Anything with constant velocity is moving at a constant speed in a straight line.

Neither of these characteristics describes the motion of the moon.

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Q: If the moon orbits the earth at a constant speed why is it always changing?
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