( ( The sun ) ( ( ( ( ( is ( ( ( around 400 ) times ) bigger ) ) ( than ( the moon ) ) ) ( but ( as ( it ( ( ( is also ) ( around ( 400 times ) ) ) ( ( further away ) ( from ( ( the earth ) ( they ( both ( appear ( to ( be ( the ( same size ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ( in ( the sky ) ) ) . ) )
(ROOT (S (NP (DT The) (NN sun)) (VP (VBZ is) (ADJP (NP (QP (RB around) (CD 400)) (NNS times)) (JJR bigger)) (PP (IN than) (NP (DT the) (NN moon))) (PRN (CC but) (SBAR (IN as) (S (NP (PRP it)) (VP (VBZ is) (ADVP (RB also)) (PP (IN around) (NP (QP (CD 400) (NNS times)))) (ADVP (ADVP (RBR further) (RB away)) (PP (IN from) (NP (NP (DT the) (NN earth)) (SBAR (S (NP (PRP they)) (DT both) (VP (VBP appear) (S (VP (TO to) (VP (VB be) (NP (DT the) (JJ same) (NN size))))))))))))))) (PP (IN in) (NP (DT the) (NN sky)))) (. .)))
The sun is around 400 times bigger than the moon but as it is also around 400 times further away from the earth they both appear to be 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))))))))))) (. .)))