Total lunar eclipses Total lunar eclipses occur when the Earth's umbra obscures all of the Moon's visible surface.
(Total lunar eclipses Total lunar eclipses; occur; T:when the Earth's umbra obscures all of the Moon's visible surface) (the Earth's umbra; obscures; all of the Moon's visible surface)
Total lunar eclipses Total lunar eclipses the Earth's umbra
occur obscures
T:when the Earth's umbra obscures all of the Moon's visible surface
all of the Moon's visible surface