( ( ( ( ( ( A ( lunar eclipse ) ) ( is ( when ( ( the moon ) ( passes ( through ( ( the ( earth 's ) ) shadow ) ) ) ) ) ) ) , ) and ) ( ( a ( total eclipse ) ) ( is ( when ( ( the ( whole moon ) ) ( disappears ( into ( ( the ( earth 's ) ) shadow ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT A) (NN lunar) (NN eclipse)) (VP (VBZ is) (SBAR (WHADVP (WRB when)) (S (NP (DT the) (NN moon)) (VP (VBZ passes) (PP (IN through) (NP (NP (DT the) (NN earth) (POS 's)) (NN shadow)))))))) (, ,) (CC and) (S (NP (DT a) (JJ total) (NN eclipse)) (VP (VBZ is) (SBAR (WHADVP (WRB when)) (S (NP (DT the) (JJ whole) (NN moon)) (VP (VBZ disappears) (PP (IN into) (NP (NP (DT the) (NN earth) (POS 's)) (NN shadow)))))))) (. .)))
A lunar eclipse is when the moon passes through the earth's shadow, and a total eclipse is when the whole moon disappears into the earth's shadow.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NP (NN earth) (POS 's)) (NN shadow)) (VP (VBZ falls) (PP (IN on) (NP (DT the) (NN moon)))))) (, ,) (NP (DT the) (NN shadow)) (VP (VBZ causes) (NP (DT a) (NN lunar) (NN eclipse))) (. .)))
When earth’s shadow falls on the moon, the shadow causes a lunar eclipse.