( ( Describe ( ( the relationship ) ( between ( ( the time ) ( for ( ( ( ( moon ( to ( ( orbit Earth ) once ) ) ) ( -LRB- ( ( sidereal period ) -RRB- ) ) ) and ) ( ( the time ) ( for ( the ( moon ( to ( ( rotate ( on ( its axis ) ) ) once ) ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Describe) (NP (NP (DT the) (NN relationship)) (PP (IN between) (NP (NP (DT the) (NN time)) (PP (IN for) (NP (NP (NP (NN moon)) (S (VP (TO to) (VP (VB orbit) (NP (NNP Earth)) (ADVP (RB once))))) (PRN (-LRB- -LRB-) (NP (JJ sidereal) (NN period)) (-RRB- -RRB-))) (CC and) (NP (NP (DT the) (NN time)) (PP (IN for) (NP (DT the) (NN moon) (S (VP (TO to) (VP (VB rotate) (PP (IN on) (NP (PRP$ its) (NNS axis))) (ADVP (RB once)))))))))))))) (. .)))
Describe the relationship between the time for moon to orbit Earth once (sidereal period) and the time for the moon to rotate on its axis once.
(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))))) (. .)))