(of successive days)become shorter because of the changing seasons
(白昼)渐短。
(of a day)approach its end
(天)渐黑,接近黄昏。
(of successive evenings or nights)start earlier because of the changing seasons
(夜晚)渐长,天黑得早
-
the nights were drawing in fast .夜晚正变得越来越长。