( ( ( The ( sun 's ) ) motion ) ( ( relative ( to ( ( ( the ( solar ( system 's ) ) ) center ) ( of mass ) ) ) ) ( ( is ( taken ( into account ) ) ) . ) ) )
(ROOT (S (NP (NP (DT The) (NN sun) (POS 's)) (NN motion)) (ADVP (JJ relative) (PP (TO to) (NP (NP (NP (DT the) (JJ solar) (NN system) (POS 's)) (NN center)) (PP (IN of) (NP (NN mass)))))) (VP (VBZ is) (VP (VBN taken) (PP (IN into) (NP (NN account))))) (. .)))
The sun's motion relative to the solar system's center of mass is taken into account.
(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.