( It ( ( 's ( in ( ( a ( ( very high ) orbit ) ) ( where ( it ( ( ( circles ( ( ( the Earth ) once ) ( a day ) ) ) , ) ( ( matching ( ( the ( Earth 's ) ) rotation ) ) ( on ( its axis ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ 's) (PP (IN in) (NP (NP (DT a) (ADJP (RB very) (JJ high)) (NN orbit)) (SBAR (WHADVP (WRB where)) (S (NP (PRP it)) (VP (VBZ circles) (NP (ADVP (NP (DT the) (NN Earth)) (RB once)) (DT a) (NN day)) (, ,) (S (VP (VBG matching) (NP (NP (DT the) (NN Earth) (POS 's)) (NN rotation)) (PP (IN on) (NP (PRP$ its) (NNS axis))))))))))) (. .)))
It's in a very high orbit where it circles the Earth once a day, matching the Earth's rotation on its axis.
(ROOT (S (NP (NNP Earth)) (VP (VBZ rotates) (PP (PP (IN on) (NP (PRP$ its) (NNS axis)) (ADVP (RB once))) (CC times) (PP (IN in) (NP (CD one) (NN day))))) (. .)))