( Earth ( ( ( rotates once ) ( on ( ( its axis ) ( about ( every ( 24 hours ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Earth)) (VP (VBZ rotates) (ADVP (RB once)) (PP (IN on) (NP (NP (PRP$ its) (NNS axis)) (PP (IN about) (NP (DT every) (CD 24) (NNS hours)))))) (. .)))
Earth rotates once on its axis about every 24 hours.
(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))))))))))) (. .)))