( So ( ( ( ( a day ) ( on ( Venus , ) ) ) ( -LRB- ( ( ( the time ) ( it ( takes ( to ( ( rotate once ) ( on ( its axis ) ) ) ) ) ) ) -RRB- ) ) ) ( ( is ( ( the ( same ( ( as 243 ) days ) ) ) ( on Earth ) ) ) . ) ) )
(ROOT (S (IN So) (NP (NP (NP (DT a) (NN day)) (PP (IN on) (NP (NP (NNP Venus)) (, ,)))) (PRN (-LRB- -LRB-) (NP (NP (DT the) (NN time)) (SBAR (S (NP (PRP it)) (VP (VBZ takes) (S (VP (TO to) (VP (VB rotate) (ADVP (RB once)) (PP (IN on) (NP (PRP$ its) (NNS axis)))))))))) (-RRB- -RRB-))) (VP (VBZ is) (NP (NP (DT the) (JJ same) (QP (RB as) (CD 243)) (NNS days)) (PP (IN on) (NP (NNP Earth))))) (. .)))
So a day on Venus, (the time it takes to rotate once on its axis) is the same as 243 days on Earth.
(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))))) (. .)))