( ( As ( ( the Earth ) ( takes ( ( one year ) ( to ( ( make ( a ( complete revolution ) ) ) ( around ( the Sun ) ) ) ) ) ) ) ) ( , ( ( ( the ( apparent position ) ) ( of ( the Sun ) ) ) ( also ( ( takes ( ( ( the ( same length ) ) ( of time ) ) ( to ( make ( ( a ( complete circuit ) ) ( of ( the ecliptic ) ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (SBAR (IN As) (S (NP (DT the) (NN Earth)) (VP (VBZ takes) (S (NP (CD one) (NN year)) (VP (TO to) (VP (VB make) (NP (DT a) (JJ complete) (NN revolution)) (PP (IN around) (NP (DT the) (NNP Sun))))))))) (, ,) (NP (NP (DT the) (JJ apparent) (NN position)) (PP (IN of) (NP (DT the) (NNP Sun)))) (ADVP (RB also)) (VP (VBZ takes) (S (NP (NP (DT the) (JJ same) (NN length)) (PP (IN of) (NP (NN time)))) (VP (TO to) (VP (VB make) (NP (NP (DT a) (JJ complete) (NN circuit)) (PP (IN of) (NP (DT the) (NN ecliptic)))))))) (. .)))
As the Earth takes one year to make a complete revolution around the Sun, the apparent position of the Sun also takes the same length of time to make a complete circuit of the ecliptic.
(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))) (. .)))