The first that occurs after sunset is called civil twilight, so named because it’s when the sky is still bright enough for people to conduct typical “daytime” outdoor activities.

Mercury will reach its greatest eastern elongation, marking the point where it is farthest from the Sun in the evening sky.

This twilight time is the brightest sunset of the phases. The Sun is just below the horizon according to Time and Date, when there's still enough natural light to continue outdoor activities.

TWILIGHT: Sunsets and sunrises are often the best before it comes up or after the sun has gone down. The sun often creates magnificent spectrums of color during those twilight hours. So, get there ...