Here, I made the Earth and the moon spheres with their positions as shown. I put the Earth at the location (0, 0, 0) meters. This is at the origin of the universe as was originally intended.

Learn the differences between our Earth, the Sun and the Moon. Then explore how together they create day and night and our different seasons with their orbits.

The sun and moon are constantly changing positions in the sky because of the Earth’s tilt and the moon’s orbit. But they have not diverged from what astronomers expect. The Earth has two ...

Look east around 4 a.m. local time, just before dawn, to see the slender form of the crescent moon climb above the horizon.

In the context of orbital mechanics involving the Earth, Moon and Sun this is rather annoying, but in 1772 Joseph-Louis Lagrange found a family of solutions in which the three masses form an ...

Eclipses occur when the Earth, moon and sun line up. A total solar eclipse will pass over the U.S. on the afternoon of April 8, cutting a narrow path across 13 states from Texas to Maine.