( ( ( ( ( ( The Earth ) ( ( is also ) ( ( rotating ( on ( its axis ) ) ) ( every ( 24 hours ) ) ) ) ) , ) and ) ( there ( are ( ( good reasons ) ( for ( believing ( that ( ( the Earth ) ( really ( does ( rotate ( within ( its ( gravitational field ) ) ) ) ) ) ) ) ) ) ) ) ) ) ; )
(ROOT (S (S (NP (DT The) (NN Earth)) (VP (VBZ is) (ADVP (RB also)) (VP (VBG rotating) (PP (IN on) (NP (PRP$ its) (NNS axis))) (NP (DT every) (CD 24) (NNS hours))))) (, ,) (CC and) (S (NP (EX there)) (VP (VBP are) (NP (NP (JJ good) (NNS reasons)) (PP (IN for) (S (VP (VBG believing) (SBAR (IN that) (S (NP (DT the) (NN Earth)) (ADVP (RB really)) (VP (VBZ does) (VP (VB rotate) (PP (IN within) (NP (PRP$ its) (JJ gravitational) (NN field))))))))))))) (: ;)))
The Earth is also rotating on its axis every 24 hours, and there are good reasons for believing that the Earth really does rotate within its gravitational field;
(ROOT (S (NP (PRP It)) (VP (VBZ takes) (NP (NP (CD 24) (NNS hours)) (PP (IN for) (NP (DT the) (NN earth) (S (VP (TO to) (VP (VB make) (NP (NP (DT a) (JJ complete) (NN rotation)) (PP (IN of) (NP (PRP$ its) (NNS axis))))))))))) (. .)))