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Every day, the moon rises in the east and sets in the west (although this may be hard to see on days when the moon is near the sun in the sky). This daily east-to-west motion is common to all natural objects in space (moon, sun, planets, stars), and is basically an illusion caused by the earth rotating in the opposite direction (west-to-east). When "we" move in one direction, everything else appears to move in the opposite direction.
In addition, there is a _real_ motion of the moon around the earth, in the west-to-east direction. If you watch the moon some night and carefully notice its position compared to some nearby stars, you will see that in one hour its position relative to the stars will have changed by about one moon-diameter. Because of this slow eastward motion, the moon rises every day about 50 minutes later than the day before.
It takes about four weeks for the moon to complete one full cycle relative to the stars. During that time, its appearance changes because of the angle at which sunlight hits it. [It is absolutely NOT because of the earth's shadow, as some have claimed.]
During a full moon, the moon is on the opposite side of the sky from the sun. When you look at the moon then, it is "fully lit," just as if there were a spotlight (the sun) behind your back, illuminating a tennis ball (the moon) in front of you.
But during other times of the month, the lighting angles are dfferent. When the time is near a new moon, it's as if the "tennis ball" has swung around so it near the same position as the "spotlight." In that case, it's the _back_ side of the tennis ball that is illuminated, and from our perspective, we see only a thin crescent of illumination.
Originally posted by Unrealised
So, perhaps the Earth is slowly, but noticeably, tipping on it's axis, and they're not telling those who care not to know?
Could be.