Lunar eclipses can only occur during the full moon. In fact, the moon must be almost perfectly full before there can be a lunar eclipse.
Full.
We do . . . Full.
full moon phase
It's always full at the time of a lunar eclipse.
Full Moon.
Only at the Full phase.
a full moon
A lunar eclipse happens during a full moon
Full Moon
A Lunar eclipse occurs only when the moon is in its full moon phase.
Full moon
It must be Full Moon.