( It ( ( ( takes ( approximately ( 26,000 years ) ) ) ( for ( the ( earth ( to ( make ( ( one ( complete revolution ) ) ( of ( the precession ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ takes) (ADVP (RB approximately) (NP (CD 26,000) (NNS years))) (PP (IN for) (NP (DT the) (NN earth) (S (VP (TO to) (VP (VB make) (NP (NP (CD one) (JJ complete) (NN revolution)) (PP (IN of) (NP (DT the) (NN precession)))))))))) (. .)))
It takes approximately 26,000 years for the earth to make one complete revolution of the precession.
(ROOT (S (NP (NNP Earth)) (VP (VBZ makes) (NP (DT a) (JJ complete) (NN revolution)) (NP (ADVP (IN around) (NP (DT the) (NN sun)) (PP (IN about) (ADVP (RB once)))) (DT every) (NN year))) (. .)))