( ( Since ( ( the earth ) ( ( is ( closer ( to ( ( the sun ) ( in ( the ( -LRB- ( ( northern hemisphere ) -RRB- ) ) ) ) ) ) ) ) winter ) ) ) ( , ( ( the ( sun dial ) ) ( ( ( ( will ( `` ( ( ( run fast ) '' ) ( during ( ( that part ) ( of ( the year ) ) ) ) ) ) ) and ) ( ( will `` ) ( ( run ( ( slow '' ) ( during ( the ( -LRB- ( ( northern hemisphere ) -RRB- ) ) ) ) ) ) summer ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Since) (S (NP (DT the) (NN earth)) (VP (VBZ is) (ADJP (ADJP (JJR closer)) (PP (TO to) (NP (NP (DT the) (NN sun)) (PP (IN in) (NP (DT the) (PRN (-LRB- -LRB-) (NP (JJ northern) (NN hemisphere)) (-RRB- -RRB-))))))) (NP (NN winter))))) (, ,) (NP (DT the) (NN sun) (NN dial)) (VP (VP (MD will) (VP (`` ``) (VB run) (ADVP (RB fast)) ('' '') (PP (IN during) (NP (NP (DT that) (NN part)) (PP (IN of) (NP (DT the) (NN year))))))) (CC and) (VP (MD will) (`` ``) (VP (VB run) (ADJP (JJ slow) ('' '') (PP (IN during) (NP (DT the) (PRN (-LRB- -LRB-) (NP (JJ northern) (NN hemisphere)) (-RRB- -RRB-))))) (NP (NN summer))))) (. .)))
Since the earth is closer to the sun in the (northern hemisphere) winter, the sun dial will "run fast" during that part of the year and will "run slow" during the (northern hemisphere) summer.
(ROOT (S (NP (NP (DT The) (NN tilt)) (PP (IN of) (NP (NP (NN earth)) (PP (IN on) (NP (PRP$ its) (NNS axis)))))) (VP (VBZ causes) (NP (NN summer)) (S (VP (TO to) (VP (VB be) (VP (VBN warmer) (PP (IN than) (NP (NP (NN winter)) (PP (IN in) (NP (DT the) (JJ northern) (NN hemisphere))))) (SBAR (IN because) (S (NP (NP (DT the) (NNS rays)) (PP (IN of) (NP (DT the) (NN sun)))) (VP (VBP strike) (NP (DT the) (JJ northern) (NN hemisphere)) (ADVP (ADVP (RBR more) (RB directly)) (PP (IN in) (NP (DT the) (NN summer)))))))))))) (. .)))