Twilight occurs when Earth's upper atmosphere scatters and refracts sunlight which illuminates the lower atmosphere. A number of atmospheric phenomenaand colors can be seen during t… See more

There are three types of twilight: 1. Civil twilight 2. Nautical twilight 3. Astronomical twilight Astronomers define the three stages of twilight on the basis of how far the Sun is below the horizo… See more

Civil twilight is the brightest form of twilight. There is enough natural sunlight during this period that artificial ligh… See more

Astronomical twilightoccurs when the Sun is between 12 degrees and 18 degrees below the horizon. Astronomical dawnis the time when the center of the Sun is at 18 degrees below the horiz… See more

Around the North Pole and the South Pole, each day-night cycle spans an entire year. In the summer, the poles experience Polar Day or Midnight Sun, when the Sun is up in the sky for several months; in the winter, during the Polar Night, the … See more

Civil twilightoccurs when the Sun is less than 6 degrees below the horizon. In the morning, civil twilight begins when the Sun is 6 degrees below the horizon and ends at sunrise. In the evening, it begins at sunset and ends when the … See more

Nautical twilightoccurs when the center of the Sun is between 6 degrees and 12 degrees below the horizon. This twilight period is less bright than civil twilight and artificial light is generally required for outdoor activities. Nautical … See more

The length of twilight depends on the latitude. Equatorialand tropical regions tend to have shorter twilight than locations on higher latitudes. During … See more