![]() The same designations are used for periods of evening twilight. noun /dsk/ /dsk/ uncountable the time of day when the light has almost gone, but it is not yet dark at dusk The street lights go on at dusk. ![]() The darker stage of twilight, especially in the evening. ![]() Nautical twilight is the period when the Sun is between 12° and 6° below the horizon, and civil twilight is the period when the Sun is between 6° below the horizon until sunrise. Nautical dusk synonyms, Nautical dusk pronunciation, Nautical dusk translation, English dictionary definition of Nautical dusk. Astronomical twilight is the period when the Sun is between 18° and 12° below the horizon. Far off in the gathering dusk the dinner bell began to sound its regular, mournful note. The twilight phases in the morning are often called dawn, while the twilight phases in the evening are referred to as dusk. Captains Wood is open dawn til dusk throughout the year. Different degrees of twilight in the morning. In addition, twilight is divided into three durations based on the angle of the Sun below the horizon. The birds were a bit hard to come by there, because it was mid-afternoon, but the activity picked up considerably nearer dusk. It is very subjective as far as the time of day that twilight occurs, because it depends on the location and elevation of the observer, the time of year and local weather conditions. The hazy light during this period is an effect caused by the scattering of the sunlight in the upper atmosphere and reflecting towards Earth. noun U uk / dsk / us Add to word list Add to word list the time in the evening when it starts to become dark: As dusk fell, we headed back to the hotel. Twilight refers to the periods between the dawn and sunrise and sunset and dusk, where sunrise and sunset are defined as the exact times when the upper edge of the disc of the Sun is at the horizon. Respectively, dusk occurs when the geometric center of the Sun is 18° below the horizon in the evening. Dawn occurs at the time that the geometric center of the Sun is 18° below the horizon in the morning.
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