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Astronomical TwilightThe period between the end of nautical twilight and the time when the Sun's centre is 18° below the horizon in the evening, and the period between the time when the Sun's centre is 18° below [..]
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Astronomical TwilightSee Twilight
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Astronomical TwilightSee twilight.
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Astronomical TwilightThe time period when the sun is between 12 and 18 degrees below the horizon at either sunrise or sunset. The sun does not contribute to the illumination of the sky before this time in the morning, or after this time in the evening. In the beginning of morning astronomical twilight and at the end of astronomical twilight in the evening, sky illumina [..]
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Astronomical TwilightThe time after nautical twilight has commenced and when the sky is dark enough, away from the sun's location, to allow astronomical work to proceed. It ends when the center of the sun is 18° below the horizon. ATMOSPHERE
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Astronomical TwilightThe time after nautical twilight has commenced and when the sky is dark enough, away from the sun's location, to allow astronomical work to proceed. It ends when the center of the sun is 18 degre [..]
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Astronomical TwilightThe time after nautical twilight
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Astronomical TwilightThe time after nautical twilight has commenced and when the sky is dark enough, away from the sun’s location, to allow astronomical work to proceed. It ends when the center of the sun is 18° below the horizon.
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