( Thus ( , ( ( our ( solar system ) ) ( ( can ( be ( seen ( ( ( as ( ( ( ( ( ( ( a ( little square ) ) , ) or ) cross ) , ) ( with four ) ) ( fold ( symmetry ( created ( by ( ( the geometry ) ( of ( ( the ( Earth-Sun system ) ) ( ( ( spinning ( very slowly ) ) , ) ( ( completing ( one ( full revolution ) ) ) ( every ( 26,000 years ) ) ) ) ) ) ) ) ) ) ) ) ) or ) so ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Thus)) (, ,) (NP (PRP$ our) (JJ solar) (NN system)) (VP (MD can) (VP (VB be) (VP (VBN seen) (SBAR (IN as) (S (NP (NP (NP (DT a) (JJ little) (NN square)) (, ,) (CC or) (NP (NN cross)) (, ,)) (PP (IN with) (NP (CD four)))) (VP (VBP fold) (NP (NP (NN symmetry)) (VP (VBN created) (PP (IN by) (NP (NP (DT the) (NN geometry)) (PP (IN of) (NP (NP (DT the) (JJ Earth-Sun) (NN system)) (VP (VBG spinning) (ADVP (RB very) (RB slowly)) (, ,) (S (VP (VBG completing) (NP (CD one) (JJ full) (NN revolution)) (NP (DT every) (CD 26,000) (NNS years))))))))))))) (CC or) (RB so))))) (. .)))
Thus, our solar system can be seen as a little square, or cross, with four fold symmetry created by the geometry of the Earth-Sun system spinning very slowly, completing one full revolution every 26,000 years or so.
(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))) (. .)))