What's the Difference Between Dusk and Twilight?

We often use the terms 'dusk' and 'twilight' interchangeably, but they have distinct astronomical meanings. Learn the real definitions of twilight, dusk, and dawn in this episode of BrainStuff, based on this article: https://science.howstuffworks.com/nature/climate-weather/atmospheric/twilight-dusk.htm

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