Why do lunar and solar eclipses not happen every month

Bottom line: There's no eclipse at every full moon and new moon because the moon's orbit is inclined to Earth's orbit by about five degrees. Most of the time, the sun, Earth and moon don't line up precisely enough to cause an eclipse

Explanation:

A lunar eclipse occurs when the Moon enters the Earth's shadow. A solar eclipse occurs when the Moon's shadow falls on the Earth. They do not happen every month because the Earth's orbit around the sun is not in the same plane as the Moon's orbit around the Earth.

The lunar eclipse occurs when the Moon enters the Earth's shadow. This happens only when the moon and the earth are in same plane. The solar eclipse takes place when moon's shadow falls earth.

This is the reason the solar and lunar eclipse does not takes place every month because there are less chances that the two of them are on the same plane.

So, the lunar and the solar eclipse takes place only when the sun and the moon lies on the same plane so that their shadow falls on each other.