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.
Civil Twilight. This is defined to be the time period when the sun is no more than 6 degrees below the horizon at either sunrise or sunset. The horizon should be clearly defined and the brightest stars should be visible under good atmospheric conditions (i.e. no moonlight, or other lights).