( ( The ( two Equinoxes ) ) ( ( are ( ( the times ) ( when ( ( ( the ( sun 's ) ) ( noon rays ) ) ( are ( directly ( vertical ( at ( the equator ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (CD two) (NNS Equinoxes)) (VP (VBP are) (NP (NP (DT the) (NNS times)) (SBAR (WHADVP (WRB when)) (S (NP (NP (DT the) (NN sun) (POS 's)) (NN noon) (NNS rays)) (VP (VBP are) (ADJP (RB directly) (JJ vertical) (PP (IN at) (NP (DT the) (NN equator))))))))) (. .)))
The two Equinoxes are the times when the sun's noon rays are directly vertical at the equator.
(ROOT (S (NP (DT The) (NN sun)) (VP (VBZ is) (ADVP (RB directly)) (PP (IN over) (NP (DT the) (NN equator))) (PP (IN during))) (. .)))