1. lunar eclipse can only occur at Full Moon, and only if the Moon passes through some portion of Earth's shadow. This can occur only when the sun, Earth, and moon are aligned
2.A solar eclipse can only take place at the phase of new moon, A solar eclipse occurs when the moon gets between Earth and the sun, and the moon casts a shadow over Earth.
3. Solar eclipses outnumber lunar eclipses, BUT when you include "penumbral lunar eclipses", the number of solar and lunar eclipses is almost the same, with lunar eclipses slightly outnumbering solar eclipses.