( ( ( The combination ) ( of ( ( ( ( the ( Moon 's ) ) size ) and ) ( ( its distance ) ( from ( the Earth ) ) ) ) ) ) ( ( causes ( ( the Moon ) ( to ( ( appear ( ( the ( same size ) ) ( in ( the sky ) ) ) ) ( as ( ( ( the Sun ) , ) ( which ( is ( ( one reason ) ( we ( can ( have ( total ( solar eclipses ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN combination)) (PP (IN of) (NP (NP (NP (DT the) (NNP Moon) (POS 's)) (NN size)) (CC and) (NP (NP (PRP$ its) (NN distance)) (PP (IN from) (NP (DT the) (NN Earth))))))) (VP (VBZ causes) (S (NP (DT the) (NNP Moon)) (VP (TO to) (VP (VB appear) (NP (NP (DT the) (JJ same) (NN size)) (PP (IN in) (NP (DT the) (NN sky)))) (PP (IN as) (NP (NP (DT the) (NNP Sun)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (NP (NP (CD one) (NN reason)) (SBAR (S (NP (PRP we)) (VP (MD can) (VP (VB have) (NP (JJ total) (JJ solar) (NNS eclipses)))))))))))))))) (. .)))
The combination of the Moon's size and its distance from the Earth causes the Moon to appear the same size in the sky as the Sun, which is one reason we can have total solar eclipses.
(ROOT (S (NP (NP (DT The) (NN sun)) (CC and) (NP (DT the) (NN moon))) (VP (VBP appear) (S (VP (TO to) (VP (VB be) (PP (IN about) (NP (NP (DT the) (JJ same) (NN size)) (PP (IN in) (NP (DT the) (NN sky))))) (SBAR (IN because) (S (NP (DT the) (NN moon)) (VP (VP (VBZ is) (ADJP (JJR smaller)) (PP (IN in) (NP (NN diameter)))) (CC and) (VP (VBZ is) (ADJP (ADJP (JJR closer)) (PP (TO to) (NP (NN earth)))) (PP (IN than) (NP (DT the) (NN sun))))))))))) (. .)))