Twilight | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-04

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Twilight


00:01:34 1 Definitions by geometry
00:02:05 2 Definitions and illustrations by illumination
00:02:26 3 Civil twilight
00:04:34 4 Nautical twilight
00:04:44 4.1 Definition
00:05:18 4.2 Nautical dawn and dusk
00:07:22 5 Astronomical twilight
00:07:32 5.1 Astronomical dawn and dusk
00:08:03 5.1.1 Definition
00:09:52 6 Times of occurrence
00:10:02 6.1 Between day and night
00:10:53 6.2 Lasting from one day to the next
00:11:28 6.3 Between one night and the next
00:12:21 6.4 Lasting for 24 hours
00:12:59 7 Duration
00:17:42 8 On other planets
00:18:09 9 In religion
00:18:18 9.1 Christianity
00:18:53 9.2 Hinduism
00:19:57 9.3 Islam
00:20:38 9.4 Judaism
00:21:05 10 Gallery
00:21:14 11 See also



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SUMMARY
=======
Twilight on Earth is the illumination of the lower atmosphere when the Sun itself is not directly visible because it is below the horizon. Twilight is produced by sunlight scattering in the upper atmosphere, illuminating the lower atmosphere so that Earth's surface is neither completely lit nor completely dark.  The word twilight is also used to denote the periods of time when this illumination occurs.The farther the Sun is below the horizon, the dimmer the twilight (other things such as atmospheric conditions being equal). When the Sun reaches 18° below the horizon, the twilight's brightness is nearly zero, and evening twilight becomes nighttime. When the Sun again reaches 18° below the horizon, nighttime becomes morning twilight. Owing to its distinctive quality, primarily the absence of shadows and the appearance of objects silhouetted against the lit sky, twilight has long been popular with photographers, who sometimes refer to it as "sweet light", and painters, who often refer to it as the blue hour, after the French expression l'heure bleue.
Twilight should not be confused with auroras, which can have a similar appearance in the night sky at high latitudes.
By analogy with evening twilight, the word twilight is also sometimes used metaphorically, to imply that something is losing strength and approaching its end. For example, very old people may be said to be "in the twilight of their lives". The collateral adjective for twilight is crepuscular, which may be used to describe the behavior of insects, fish, and mammals that are most active during this period.