The time when the sun begins to cast its light in the sky is known as _______.

dusk

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dawn

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sunrise

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sunset

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Solution

The correct option is B dawn
Dawn or astronomical dawn is the time that marks, depending on the specific usage, the beginning of the twilight before sunrise, the period of the pre-sunrise.
Astronomical twilight begins at the moment after which the sky is no longer completely dark after astronomical dawn.
This occurs when the Sun is 18 degrees below the horizon in the morning.

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