( ( Twenty-four hours ) ( ( ( ( ( ( equals one ) ( ( day and ) night ) ) ( on Earth ) ) , ) ( ( ( the length ) ( of time ) ) ( it ( takes ( the ( Earth ( to ( ( rotate once ) ( on ( its axis ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Twenty-four) (NNS hours)) (VP (VBZ equals) (NP (CD one)) (NP (NN day) (CC and) (NN night)) (PP (IN on) (NP (NNP Earth))) (, ,) (NP (NP (DT the) (NN length)) (PP (IN of) (NP (NN time))) (SBAR (S (NP (PRP it)) (VP (VBZ takes) (NP (DT the) (NN Earth) (S (VP (TO to) (VP (VB rotate) (ADVP (RB once)) (PP (IN on) (NP (PRP$ its) (NNS axis)))))))))))) (. .)))
Twenty-four hours equals one day and night on Earth, the length of time it takes the Earth to rotate once 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))))) (. .)))