( ( ( The length ) ( of ( daylight ( in ( the ( Northern Hemisphere ) ) ) ) ) ) ( ( continues ( to ( increase ( until ( ( the ( first day ) ) ( of summer ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN length)) (PP (IN of) (NP (NP (NN daylight)) (PP (IN in) (NP (DT the) (NNP Northern) (NNP Hemisphere)))))) (VP (VBZ continues) (S (VP (TO to) (VP (VB increase) (PP (IN until) (NP (NP (DT the) (JJ first) (NN day)) (PP (IN of) (NP (NN summer))))))))) (. .)))
The length of daylight in the Northern Hemisphere continues to increase until the first day of summer.
(ROOT (S (NP (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN increase)) (PP (IN in) (NP (NN length)))) (VP (VBZ happens) (PP (TO to) (NP (NN metal) (NN railroad) (NNS tracks))) (PP (IN during) (NP (NP (DT the) (NN heat)) (PP (IN of) (NP (DT a) (NN summer) (NN day)))))) (. .)))