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Light is needed to see at anytime, day or night. However during the day there is usually plenty of light provided by the sun. During the night the sunlight is blocked by the earth and other than reflected light shining from the moon and the starlight one generally needs to create an artificial light source (e.g. candle, whale oil lamp, kerosene lamp, gas lamp, electric light) to get a usable amount of light to see well enough to perform useful tasks.

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