( ( If ( ( the earth ) ( is ( moving ( around ( the sun ) ) ) ) ) ) ( , ( ( nearby stars ) ( ( should ( appear ( to ( ( move ( on ( the sky ) ) ) ( as ( ( the earth ) ( ( moves ( from ( ( one side ) ( of ( the sun ) ) ) ) ) ( to ( the other ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (DT the) (NN earth)) (VP (VBZ is) (VP (VBG moving) (PP (IN around) (NP (DT the) (NN sun))))))) (, ,) (NP (JJ nearby) (NNS stars)) (VP (MD should) (VP (VB appear) (S (VP (TO to) (VP (VB move) (PP (IN on) (NP (DT the) (NN sky))) (SBAR (IN as) (S (NP (DT the) (NN earth)) (VP (VBZ moves) (PP (IN from) (NP (NP (CD one) (NN side)) (PP (IN of) (NP (DT the) (NN sun))))) (PP (TO to) (NP (DT the) (JJ other))))))))))) (. .)))
If the earth is moving around the sun, nearby stars should appear to move on the sky as the earth moves from one side of the sun to the other.
(ROOT (S (PP (IN From) (NP (NN earth))) (, ,) (NP (DT the) (NN sun)) (VP (VBZ appears) (NP (NN brighter)) (PP (IN than) (NP (DT any) (JJ other) (NN star))) (SBAR (IN because) (S (NP (DT the) (NN sun)) (VP (VBZ is) (NP (DT the) (JJS closest) (NN star))))))))