Twilight what is this time of day? How can I describe it?

Twilight what is this time of day? How can I describe it?

  1. Twilight is not the time of day this movie was on STS and then on tnt
  2. Twilight is not the time of day
  3. part of the day between night and sunrise and between sunset and night, during which the Sun is already beyond the horizon and invisible, but there are already signs of sunset due to the scattering of sunlight in the upper layers of the Earth's atmosphere.
  4. From the time of sunset until nightfall.
  5. part of the day between night and sunrise and between sunset and night
  6. Our Earth is surrounded by a thick layer of air with an air envelope. This shell also shines after sunset, and from this there are twilight on the Earth. The air envelope, or, as it is called, the atmosphere is lit, because it does not illuminate the rays of the already sunset sun.

    People, being on the non-illuminated half of the Earth, will not see the Sun because it will be closed from them by the bulge of the Earth. The sun for them will be under the horizon, that is, below the line where, it seems to us, the sky converges with the Earth.

    However, if the Sun, being under the horizon, can not illuminate people on Earth, it can still illuminate the air that is above their head and rises high above the earth's surface.

    Twilight is the time between the moment of sunset and the approach of total darkness (evening twilight), and between the end of total darkness and the rising of the sun (morning twilight). When the sun sets over the horizon, part of the sky continues to be illuminated by the diffusion of sunlight in the high layers of the atmosphere. Illuminance decreases first quickly, and then slower.

    The duration of twilight depends on the geographical latitude (the higher the latitude, the longer the twilight), the time of year and the weather conditions. The longest twilight is on the days of the summer and winter solstices (22 June and 22 December), the shortest - in the days of the spring and autumnal equinoxes (21 March and 23 September). Throughout twilight, the value of light (measured in lux) varies almost a billion times.

    Civil twilight begins at the time of sunset (lighting of about 1000 lux) and ends when the Sun is beyond the horizon at an angle of 6-8 (lighting decreases to 1 ... 4 lux).

    Marine (navigational) twilight begins at the end of civilian and ends when the Sun leaves the horizon at 12 (lighting falls to 0.006 suites), when lighting is not enough to distinguish non-illuminated objects on the shore in the sea, and only the coastline can be distinguished.

    Astronomical twilight begins after the sea and ends when the Sun dips beyond the horizon line to 18 (the illumination falls to 0.0001-0.00001 lux) and the complete disappearance of the blue of the sky. This kind of twilight is called astronomical due to the fact that at that time the illumination falls to the point where astronomers can begin to do their work on studying the night sky, but the best time for astronomical observations is total darkness.

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