Question

Why We do not get a lunar eclipse on every full moon.

Answer 1

1. Because the Moon lies above or below the ecliptic plane, which is the plane of the Earth's orbit around the Sun, eclipses do not occur on the New and Full Moons of every month.
2. The Sun, Moon, and Earth only coincide to cause an eclipse when the Moon's orbit crosses over the ecliptic plane.
3. This happens at least twice a year, at different periods, for a few weeks at a time.

Hence We do not get a lunar eclipse on every full moon.