( Earth ( ( takes ( ( ( ( 23 hours ) and ) ( ( 56 minutes ) ( on average ) ) ) ( to ( ( ( ( make ( a ( complete rotation ) ) ) ( with respect ) ) ( to ( ( ( the sun ) , ) ( which ( ( adds up ) ( to ( a ( single day ) ) ) ) ) ) ) ) ( every ( four years ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Earth)) (VP (VBZ takes) (S (NP (NP (CD 23) (NNS hours)) (CC and) (NP (NP (CD 56) (NNS minutes)) (PP (IN on) (NP (NN average))))) (VP (TO to) (VP (VB make) (NP (DT a) (JJ complete) (NN rotation)) (PP (IN with) (NP (NN respect))) (PP (TO to) (NP (NP (DT the) (NN sun)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ adds) (PRT (RP up)) (PP (TO to) (NP (DT a) (JJ single) (NN day)))))))) (NP (DT every) (CD four) (NNS years)))))) (. .)))
Earth takes 23 hours and 56 minutes on average to make a complete rotation with respect to the sun, which adds up to a single day every four years.
(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))) (. .)))