( ( ( Angular distance ) ( of ( a celestial ) ) ) ( ( object ( from ( ( the sun ) ( in ( the sky ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Angular) (NN distance)) (PP (IN of) (NP (DT a) (NN celestial)))) (VP (VBP object) (PP (IN from) (NP (NP (DT the) (NN sun)) (PP (IN in) (NP (DT the) (NN sky)))))) (. .)))
Angular distance of a celestial object from the sun in the sky.
(ROOT (S (S (VP (VBG Looking) (ADVP (RB directly)) (PP (IN at) (NP (DT the) (NN sun))))) (VP (MD can) (VP (VB cause) (NP (NN blindness)))) (. .)))