As Alter points out, the word âimplies victory and dominance.â The âtrump cardâ in bridge and other card games is a card of a suit that temporarily ranks above any other and is derived from âtriumph,â a name for an early card game.
Astronomical Twilight, Dawn, and Dusk. Astronomical twilight occurs when the Sun is between 12 degrees and 18 degrees below the horizon. Astronomical dawn is the time when the geometric center of the Sun is at 18 degrees below the horizon. Before this time, the sky is absolutely dark.
Twilight is the time preceding sunrise and following sunset when the sky is partially illuminated. In polar regions twilight can persist for long periods when the Sun is below the horizon for extended periods of time. A definition of sunrise and sunset is a helpful starting point in this description of twilight.