( ( ( The ( planet Venus ) ) ( at ( its ( most brilliant ) ) ) ) ( ( is ( ( about ( magnitude -4.7 ) ) ( , ( but ( after ( that ( we ( have ( ( ( only ( the Moon ) ) and ) ( Sun ( as guides ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN planet) (NN Venus)) (PP (IN at) (NP (PRP$ its) (JJS most) (NNS brilliant)))) (VP (VBZ is) (UCP (PP (IN about) (NP (NN magnitude) (CD -4.7))) (, ,) (CC but) (SBAR (RB after) (IN that) (S (NP (PRP we)) (VP (VBP have) (NP (NP (RB only) (DT the) (NNP Moon)) (CC and) (NP (NP (NNP Sun)) (PP (IN as) (NP (NNS guides)))))))))) (. .)))
The planet Venus at its most brilliant is about magnitude -4.7, but after that we have only the Moon and Sun as guides.
(ROOT (S (NP (NNP Venus)) (VP (VBZ has) (NP (DT the) (JJS most) (NNS volcanoes))) (. .)))