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Dawn aus Wikipedia. Zum Beitrag

Dawn - Wikipedia, the free encyclopedia a.new,#quickbar a.new{color:#ba0000} /* cache key: enwiki:resourceloader:filter:minify-css:4:f2a9127573a22335c2a9102b208c73e7 */ Dawn From Wikipedia, the free encyclopedia Jump to: , Dawn is the beginning of morning twilight Dawn sky in Chicago Early morning in Xepon, Laos (July 2004) Dawn in mostly cloudy conditions at around 5:30 a.m. in Peng Chau, Hong Kong For other uses, see Dawn (disambiguation). Dawn is the time that marks the beginning of the twilight before sunrise. It is recognized by the presence of weak sunlight, while the sun itself is still below the horizon. Dawn should not be confused with sunrise, which is the moment when the leading edge of the sun itself appears above the horizon. The duration of the twilight period between dawn and sunrise varies greatly depending on the observer's latitude, from a few minutes in equatorial regions to many hours in polar regions. Dawn may easily be determined by observing a thread. When the color of a thread can be determined, changing from black to the thread's distinctive color, the 'crack of dawn' has occurred. This same measure of ambient light can be used to determine, conversely, the instant of dusk.

Technical definitions

There are also more technical definitions of dawn, including the following: Astronomical dawn  the moment after which the sky is no longer completely dark; formally defined as the time at which the sun is 18 Nautical dawn the time at which there is enough sunlight for the horizon and some objects to be distinguishable; formally, when the sun is 12 degrees below the horizon in the morning. Civil dawn  that time at which there is enough light for objects to be distinguishable, so ... mehr

Dawn aus Wikipedia. Zum Beitrag