While the moon is orbiting the Earth, the Earth is progressing in its orbit around the Sun. After completing a sidereal month the Moon must move a little further to reach the new position having the same angular distance from the Sun. This longer period is called the synodic month (Greek:...
Orbiting between moons Mimas andTethys, Enceladus circles Saturn from about 148,000 miles away. It takes about 33 hours for it to complete one orbit. Like our own moon, Enceladus is tidally locked with Saturn, meaning that the same side always faces the planet. It also has what's called ...