Twilight

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Twilight

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The periods of incomplete darkness following sunset (evening twilight) or preceding sunrise (morning twilight). </dd>
Twilight is designated as civil, nautical, or astronomical, as the darker limit occurs when the center of the sun is at zenith distances of 96 degrees, 102 degrees, and 108 degrees, respectively. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use