Topic: Astronomical Twilight
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What is astronomical twilight?
( ′as·trə′näm·ə·kəl ′twī′līt ) (astronomy) The period of incomplete darkness when the center of the sun is more than 6° but not more than 18° below the celestial horizon. Read More »
Source: http://www.answers.com/topic/astronomical-twilight-astronomy
What and when is astronomical twilight?
Astronomical twilight is defined when the sun is 18 degrees below the horizon.... Read More »
Source: http://www.chacha.com/question/what-and-when-is-astronomical-twil...
What is the difference between Civil Twilight, Nautical Twilight ...
Civil twilight ends after sunset and begins before sunrise when the sun is six degrees below the horizon. Twilight on the ocean lasts longer. The light fades until the Sun is twelve degrees below the horizon. At the point of astronomical da... Read More »
Source: http://www.answerbag.com/q_view/1378995
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Astronomical Twilight
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Astronomical twilight - Sun is 12-18 degrees below horizon Nautical twilight - Sun is 6-12 degrees below horizon Civil twilight - Sun is 0-6 degrees below horizon Civil twilight is what people think of as twilight.
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Source: http://www.answerbag.com/q_view/425274
For civil twilight, the sun is between the horizon and 6 degrees below the horizon. During nautical twilight, it is between 6 and 12 degrees below the horizon. During astronomical twilight, the sun is between 12 and 18 degrees below the hor...
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Source: http://answers.yahoo.com/question/index?qid=1006032510127
Civil twilight refers to the time before sunrise and after sunset when the center of the sun is 6 degrees or less below the horizon. In general, especially if it's not very cloudy, you can move around easily outdoors without artificial ligh...
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Source: http://www.usatoday.com/weather/resources/askjack/wasksky.htm
Where in the UK? On February 18th, I get the following data: Extreme south, 49 degrees N: early dusk twilight lasts 45 minutes, then civil twilight for 50 minutes, and nautical twilight for 49 minutes. Total time to full darkness: 2 hours 2...
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Source: http://uk.answers.yahoo.com/question/index?qid=20110215094848AAck...
Civil Twilight starts (in the morning) or ends (in the evening) when the sun is 6 degrees below the horizon. This is generally considered the limit of useable daylight; before civil dawn or after civil dusk artificial light is needed for mo...
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Source: http://www.thetimeandplace.info/suntimes/sunfaq.php
Astronomical, civil, and nautical twilight times are all defined by the position of the sun measured in degrees beyond the horizon of the Earth. Please see the Glossary for more complete explanations of these terms.
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Source: http://skyclock.com/web/faq.html
