When the moon blocks the sun or a part of it, it's called a solar eclipse, and it can only happen during the new moon phase.
(the moon; blocks; the sun or a part of it) (it; 's called; a solar eclipse; T:When the moon blocks the sun or a part of it) (it; can only happen; T:during the new moon phase)
the moon it it
blocks 's called can only happen
the sun or a part of it
a solar eclipse T:When the moon blocks the sun or a part of it
T:during the new moon phase