‘Twilight’ means not completely light or dark, so it can occur when the sun is rising and when it is setting. It can also mean the way a mostly dark room with one candle looks, or when you are deep underwater in a cloudy lake on a sunny day. It isn’t usually used as a specific time of day, but you could say, for example ‘deer come out early in the day and go to the waterhole at twilight.’
The phrase ‘the twilight zone’ comes from high altitude pilots at the dawn of the space Age. They noticed that as the atmosphere got thinner the sky got darker. The ‘twilight zone’ was the area where it seemed light and dark at the same time.
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