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Civil twilight Morning civil twilight begins when the geometric center of the sun is 6° below the horizon (the point of civil dawn), and ends at sunrise.Evening civil twilight begins at sunset and ends when the center of the sun reaches 6° below the horizon (the point of civil dusk).when astronomical dusk occurs) and disappear when the sun moves to within 18° of the horizon in the morning (when astronomical dawn occurs).However, due to light pollution, some localities-generally those in large cities-may never have the opportunity to view even fourth-magnitude stars, irrespective of the presence of any twilight at all.It’s also an awesome list for the single girls and gents who are contemplating relocation. I’m working with the folks at Interracial to create some sort of info graphic or interactive map because we both just love you guys to pieces. Look at the list and feel free to confirm, deny, vehemently debate, agree, disagree, or add your city, county, state or township along with a reason or two why it’s a good place for us to plant some roots.Twilight Twilight is the time between dawn and sunrise, and the time between sunset and dusk.A fixed period (most commonly 30 minutes after sunset or before sunrise) is typically used in such statutes, rather than how many degrees the sun is below the horizon.Civil twilight can also be described as the limit at which twilight illumination is sufficient, under good weather conditions, for terrestrial objects to be clearly distinguished; at the beginning of morning civil twilight, or end of evening civil twilight, the horizon is clearly defined and the brightest stars are visible under good atmospheric conditions.
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At this time, sailors can take reliable star sights of well-known stars, using a visible horizon for reference.
The end of this period in the evening, or its beginning in the morning, is also the time at which traces of illumination near the sunset or sunrise point of the horizon are very difficult if not impossible to discern (this often being referred to as "first light" before civil dawn and "nightfall" after civil dusk).
Length The length of twilight after sunset and before sunrise is heavily influenced by the latitude of the observer.
In the Arctic and Antarctic regions, twilight (if at all) can last for several hours.
Definitions Twilight is defined according to the solar elevation angle 0s, which is the position of the geometric center of the sun relative to the horizon.