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Sunset
Twilight
Darkness
Most people know that sunset is the time when the sun goes down. But did you know that the sun doesn't actually set? Instead, Earth rotates into darkness, giving us the illusion that the sun is setting. So what causes sunset?
Well, it's a combination of things. The Earth's atmosphere scatters sunlight in every direction, but blue and violet light are scattered more than other colors. This is why the sky is usually blue during the daytime. As the sun gets lower in the sky, the atmosphere becomes thicker and more dense.
This scattering of sunlight happens to a greater extent, and we see red and orange light more than blue and violet light. That's why sunset is usually a beautiful red or orange color. So next time you see sunset, remember that you're actually seeing Earth rotate into darkness!
Bradley, Iowa, is located in southeastern Iowa, just off Interstate 35. The city has a population of 36,901, and it is the county seat of Woodbury County. Bradley is also close to the spillover population of Des Moines.
The climate in Bradley is generally warm, with considerable seasonal variation. Winters are cold and snowy, with a mean temperature of 26.9 degrees Fahrenheit. Springs and summer are hot and humid, with a mean temperature of 78.2 degrees Fahrenheit. However, Bradley averages only 17.5 inches of snowfall per year, which is just 2.5 inches short of the state average.
Bradley is located at 41°5′5″ North, 93°5′5″ West. It is just off Interstate 35, at the eastern edge of the Moines metropolitan area.
The city occupies a high ridge in the southeast quadrant of the state, surrounded on three sides by the Grand River. The city is bisected by Main Street, which forms the commercial center. Bradley Park is located in the center of the city, and the Bradley County Courthouse is on the north side of Main Street.
Bradley's census-designated place (CDP) population was 8,618 in 2010.
The climate in Bradley is warm, with considerable seasonal variation. Winters are cold and snowy, with a mean temperature of 26.9 degrees Fahrenheit. Springs and summer are hot and humid, with a mean temperature of 78.2 degrees Fahrenheit. However, Bradley averages only 17.5 inches of snowfall per year, which is just 2.5 inches short of the state average.
The population of Bradley was 36,901 as of the 2010 census. The population density was 1,531.7 people per square mile (595.7/km²).
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}As the sun sets, the sky slowly grows dark. For many people, this is a time to relax and wind down for the day. But have you ever wondered exactly when it gets dark? The answer may surprise you.
Did you know that darkness actually begins long before the sun sets? As the sun gets lower in the sky, its light has to travel through more atmosphere. This filters out some of the blue light, making the sun look redder. At the same time, shadows get longer and darker. So by the time the sun finally dips below the horizon, darkness has already begun to fall.
Of course, not all places on Earth experience darkness at the same time. Near the equator, the sun sets and rises almost directly overhead. This means that there is less of a difference between daytime and nighttime. Closer to the poles, however, the sun stays low in the sky for much of the year. This leads to longer periods of darkness during wintertime.