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Jim Ross

Civil Twilight in Banff, Alberta, Canada!!!

Civil Twilight in Banff, Alberta, Canada...

With the sun down and the amazing blue / purple hour going off, we scrambled for a location to shoot some of these amazing colors... We found this open pasture that I think gives a great foreground, contrasting textures, colors and depth to this shot...

The term Civil Twilight:

Morning civil twilight begins when the geometric center of the sun is 6° below the horizon (civil dawn) and ends at sunrise. Evening civil twilight begins at sunset and ends when the geometric center of the sun reaches 6° below the horizon (civil dusk). The brightest stars appear during the civil twilight, as well as planets, such as Venus, which is known as the "morning star" or "evening star". During this period there is enough light from the sun that artificial sources of light may not be needed to carry on outdoor activities. This concept is sometimes enshrined in laws, for example, when drivers of automobiles must turn on their headlights (called lighting-up time in the UK); when pilots may exercise the rights to fly aircraft; restrictions on hunting; or if the crime of burglary is to be treated as nighttime burglary, which carries stiffer penalties in some jurisdictions. 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 clear 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 clear atmospheric conditions.

Sourced from Wikipedia:

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