( ( When ( ( the Earth ) ( moves ( between ( ( ( the Sun ) and ) ( the Moon ) ) ) ) ) ) ( , ( it ( ( ( ( ( casts ( its shadow ) ) ( on ( its ( own satellite ) ) ) ) , ) ( causing ( a ( lunar eclipse ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (DT the) (NN Earth)) (VP (VBZ moves) (PP (IN between) (NP (NP (DT the) (NNP Sun)) (CC and) (NP (DT the) (NN Moon))))))) (, ,) (NP (PRP it)) (VP (VBZ casts) (NP (PRP$ its) (NN shadow)) (PP (IN on) (NP (PRP$ its) (JJ own) (NN satellite))) (, ,) (S (VP (VBG causing) (NP (DT a) (NN lunar) (NN eclipse))))) (. .)))
When the Earth moves between the Sun and the Moon, it casts its shadow on its own satellite, causing a lunar eclipse.
(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.