Let's say we want to build a model of the sun and Earth alone. Earth has a radius of about 6,371 kilometers (3,959 miles), but let's represent this with a marble 1 centimeter in diameter.

Learn the differences between our Earth, the Sun and the Moon. ... It takes just over 27 days for the Moon to orbit (go around) the Earth.It takes a little longer, 29.5 days, ...

This is because the moon's orbit around Earth (and Earth's orbit around the sun) are elliptical, so the precise distances between the three bodies change, according to NASA.

(via minutephysics) We think of the moon as orbiting the earth, following a spiraling trajectory as the earth itself orbits the sun.But this is wrong. Not only is the moon's orbit NOT a spiral ...

This is a beautiful Lego space set, with approximate month and year positions of the earth's and moon's orbit around the sun and gives plenty of STEM stimulation at the same time. $59.99 at Amazon ...

Will Earth lose its moon before the sun destroys us? ... About 4.5 billion years ago, "when the moon was first formed, the rotation rate of the Earth would have been significantly faster, ...