( ( In ( the ( heliocentric system ) ) ) ( , ( ( the Sun ) ( ( is ( considered ( to ( be ( ( the center ) ( of ( the ( solar system ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (DT the) (JJ heliocentric) (NN system))) (, ,) (NP (DT the) (NNP Sun)) (VP (VBZ is) (VP (VBN considered) (S (VP (TO to) (VP (VB be) (NP (NP (DT the) (NN center)) (PP (IN of) (NP (DT the) (JJ solar) (NN system))))))))) (. .)))
In the heliocentric system , the Sun is considered to be the center of the solar system.
(ROOT (S (NP (DT The) (NN sun)) (VP (VBZ is) (NP (NP (DT the) (NN center)) (PP (IN of) (NP (PRP$ our) (JJ solar) (NN system))))) (. .)))
The sun is the center of our solar system.