( ( ( The ( Earth rotates ) ) ( on ( its axis ) ) ) ( ( ( ( once ( every ( 24 hours ) ) ) and ) ( ( revolves around ) ( ( the sun ) ( ( once ( every 365 ) ) days ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNP Earth) (NNS rotates)) (PP (IN on) (NP (PRP$ its) (NNS axis)))) (VP (VP (ADVP (RB once)) (NP (DT every) (CD 24) (NNS hours))) (CC and) (VP (VBZ revolves) (PRT (RP around)) (NP (NP (DT the) (NN sun)) (NP (QP (RB once) (DT every) (CD 365)) (NNS days))))) (. .)))
The Earth rotates on its axis once every 24 hours and revolves around the sun once every 365 days.
(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))))) (. .)))