At eight in the morning.
( ( ( At eight ) ( in ( the morning ) ) ) . )
(ROOT (NP (NP (QP (IN At) (CD eight))) (PP (IN in) (NP (DT the) (NN morning))) (. .)))
The prayer will take place at eight.
( ( The prayer ) ( ( will ( ( take place ) ( at eight ) ) ) . ) )
(ROOT (S (NP (DT The) (NN prayer)) (VP (MD will) (VP (VB take) (NP (NN place)) (PP (IN at) (NP (CD eight))))) (. .)))