( ( ( ( ( Earth ( ( rotates ( on ( its axis ) ) ) once/day ) ) ( , ( ( ( the Moon ) ( revolves ( around ( the ( Earth once/month ) ) ) ) ) , ) ) ) and ) ( Earth ( revolves ( around ( the ( sun once/year ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNP Earth)) (VP (VBZ rotates) (PP (IN on) (NP (PRP$ its) (NNS axis))) (ADVP (RB once/day)))) (PRN (, ,) (S (NP (DT the) (NNP Moon)) (VP (VBZ revolves) (PP (IN around) (NP (DT the) (NNP Earth) (NN once/month))))) (, ,)) (CC and) (S (NP (NNP Earth)) (VP (VBZ revolves) (PP (IN around) (NP (DT the) (NN sun) (NN once/year))))) (. .)))
Earth rotates on its axis once/day, the Moon revolves around the Earth once/month, and Earth revolves around the sun once/year.
(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))))) (. .)))