( Therefore ( , ( ( ( ( the Moon ) and ) ( the Sun ) ) ( ( ( ( do not ) always ) ( appear ( to ( be ( ( precisely ( the ( same size ) ) ) ( in ( the sky ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Therefore)) (, ,) (NP (NP (DT the) (NN Moon)) (CC and) (NP (DT the) (NNP Sun))) (VP (VBP do) (RB not) (ADVP (RB always)) (VP (VB appear) (S (VP (TO to) (VP (VB be) (NP (NP (RB precisely) (DT the) (JJ same) (NN size)) (PP (IN in) (NP (DT the) (NN sky))))))))) (. .)))
Therefore, the Moon and the Sun do not always appear to be precisely the same size in the sky.
(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))))))))))) (. .)))