( ( ( Effect ( of Tides ) ) ( on ( Earth ( s Rotation ) ) ) ) ( : ( ( ( ( ( p169 ... ) ( ( ( Earth rotates ) ( once ( on ( ( its axis ) ( -LRB- ( ( relative ( to ( the stars ) ) ) -RRB- ) ) ) ) ) ) ( in ( 23h 56m ) ) ) ) - ) ( 1 ( sidereal day ) ) ) . ) ) )
(ROOT (FRAG (NP (NP (NN Effect)) (PP (IN of) (NP (NNP Tides))) (PP (IN on) (NP (NNP Earth) (NNP s) (NNP Rotation)))) (: :) (NP (NP (NNS p169)) (: ...) (NP (NP (NN Earth) (NNS rotates)) (ADVP (RB once) (PP (IN on) (NP (NP (PRP$ its) (NNS axis)) (PRN (-LRB- -LRB-) (ADJP (JJ relative) (PP (TO to) (NP (DT the) (NNS stars)))) (-RRB- -RRB-))))) (PP (IN in) (NP (JJ 23h) (NNS 56m)))) (: -) (NP (CD 1) (JJ sidereal) (NN day))) (. .)))
Effect of Tides on Earth s Rotation : p169 ... Earth rotates once on its axis (relative to the stars) in 23h 56m - 1 sidereal day.
(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))))) (. .)))