How many kinds of eclipse are there?
On Earth, we get solar eclipses and lunar eclipses. A solar eclipse is when the Sun is obscured by all or part of the moon so that there is a shadow cast directly onto the surface of the earth. A lunar eclipse is when the Moon passes wholly or partially through the shadow of the Earth caused by the Sun, which darkens the Moon, or changes it distinctly reddish. Obviously in other positions in space, other kinds of eclipses would be possible. For instance, Mars has two moons, so it two different kinds of lunar eclipses. On a planet orbiting a binary star, you might speak of an eclipse when one star passes behind another, etc.
