( ( ( ( ( ( ( The Shadow ) ( of earth ) ) ( sometimes ( ( falls ( on ( the ( full ( moon only ) ) ) ) ) ( -LRB- ( ( earth ( ( comes in ) ( between ( ( sun and ) moon ) ) ) ) -RRB- ) ) ) ) ) , ) and ) ( then ( it ( is ( lunar eclipse ) ) ) ) ) . )
(ROOT (S (S (NP (NP (DT The) (NX (NNP Shadow))) (PP (IN of) (NP (NN earth)))) (VP (ADVP (RB sometimes)) (VBZ falls) (PP (IN on) (NP (DT the) (JJ full) (NN moon) (RB only))) (PRN (-LRB- -LRB-) (S (NP (NN earth)) (VP (VBZ comes) (PRT (RP in)) (PP (IN between) (NP (NN sun) (CC and) (NN moon))))) (-RRB- -RRB-)))) (, ,) (CC and) (S (ADVP (RB then)) (NP (PRP it)) (VP (VBZ is) (NP (NN lunar) (NN eclipse)))) (. .)))
The Shadow of earth sometimes falls on the full moon only (earth comes in between sun and moon), and then it is 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.