Why aren't there eclipses every month?

If the sun, Earth and moon are lined up, shouldn't we get a lunar and solar eclipse every month? Clearly, we don't, but why not?

Solar eclipse over the USA

Mark your calendar.  On Sunday, May 20th, the sun is going to turn into a ring of fire.  It's an annular solar eclipse--the first one in the USA in almost 18 years.

Total solar eclipse plunges Antarctica into darkness

A total solar eclipse plunged Antarctica from summer into darkness early Saturday in a rare astronomical spectacle witnessed by a handful of scientists and thrill-seekers—and countless penguins.

SDO witnesses a double eclipse (w/ video)

Early in the morning of Sept. 1, 2016, NASA's Solar Dynamics Observatory, or SDO, caught both Earth and the moon crossing in front of the sun. SDO keeps a constant eye on the sun, but during SDO's semiannual eclipse seasons, ...

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