The gloaming

Dusk. Twilight. The gloaming. Whatever you refer to it as, we all know it by the distinct lighting and uncanny effect on our sense of possibility. You can't quite put your finger on it—both figuratively and literally—but, this occurrence has etched the minds and memories of poets and paupers alike.

From Thomas Pynchon's Gravity's Rainbow:

"... there comes to Slothrop the best feeling dusk in a foreign city can bring: just where sky's light balances the electric lamplight in the street, just before the first star, some promise of events without cause, surprises, a direction at right angles to every direction his life has been able to find up till now."