( ( Sidereal time ) ( ( is ( based ( on ( ( the time ) ( it ( takes ( ( ( ( the ( earth ( to ( make ( ( one ( complete rotation ) ) ( about ( its axis ) ) ) ) ) ) ) , ) or ) ( 360 degrees ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Sidereal) (NN time)) (VP (VBZ is) (VP (VBN based) (PP (IN on) (NP (NP (DT the) (NN time)) (SBAR (S (NP (PRP it)) (VP (VBZ takes) (NP (NP (DT the) (NN earth) (S (VP (TO to) (VP (VB make) (NP (NP (CD one) (JJ complete) (NN rotation)) (PP (IN about) (NP (PRP$ its) (NNS axis)))))))) (, ,) (CC or) (NP (CD 360) (NNS degrees)))))))))) (. .)))
Sidereal time is based on the time it takes the earth to make one complete rotation about its axis, or 360 degrees.
(ROOT (S (NP (PRP It)) (VP (VBZ takes) (NP (NN earth) (CD one) (NN week)) (S (VP (TO to) (VP (VB rotate) (PP (IN on) (NP (PRP$ its) (NNS axis))) (NP (CD seven) (NNS times)))))) (. .)))