Heavenly bodies other than the earth and the moon also eclipses each other. The planet Jupiter sometimes blocks sun light from its moon. Likewise, Jupiter's moons sometimes cast shadows on the planet. Sometimes the moon or some other heavenly body blocks light from a planet or a distant star. Astronomers use the term occultation for this blocking action.
Astronomers also refer to a certain kind of variable star as an eclipsing binary.
There was a lunar eclipse on January 21, 2000. Eclipses are very cool to watch.