The moon orbits Earth about once every 27.322 days. Viewed from Earth, the moon's orbit is nearly a perfect circle tilted approximately 5 degrees to Earth's orbit. Due to tidal forces, the same side of the moon always fa... More » Science Astronomy Our Moon

According to, the Sun is nearly spherical with a very slight equatorial bulge, Earth is an oblate spheroid, and the Moon is somewhat lemon-shaped. These three bodies' shapes are influenced almost entirely b... More » Science Astronomy Our Sun

The Earth has only one moon. The existence of a moon orbiting the Earth is responsible for several phenomena on Earth that affect life, including the generation of tides on a daily basis. More » Science Astronomy Our Moon
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The moon orbits the Earth at approximately 2,288 miles per hour and completes one full orbit every 27.322 days. Additionally, the moon takes approximately 27 days to complete one full rotation on its own axis, called its... More » Science Astronomy Our Moon

One of the many differences between the Earth and the moon is simply that the Earth is a planet and the moon orbits the Earth as its satellite. The Earth's circumference is 24,873.6 miles, while that of the moon is 6783.... More » Science Astronomy Our Moon

The moon travels in an elliptical orbit, and at perigee, the closest it gets to Earth, it stands about 225,623 miles, or 363,104 kilometers away. More » Science Astronomy Our Moon

Moon phases occur because the angle of the Earth, moon and sun changes as the moon orbits the Earth. One-half of the moon is always illuminated by the sun. As a person's angle of sight changes, different portions of sunl... More » Science Astronomy Our Moon