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The initialisms BMNT (begin morning nautical twilight, i.e. nautical dawn) and EENT (end evening nautical twilight, i.e. nautical dusk) are used and considered when planning military operations. A military unit may treat BMNT and EENT with heightened security, e.g. by "standing to", for which everyone assumes a defensive position.
Conventionally generated and sourced electricity remains the most used source for landscape lighting in the early twenty-first century. With the combination of increasing demand for more efficient lighting, increasing availability of sustainable designs, global warming considerations, and aesthetic and safety concerns in garden and landscape design the methods and equipment of outdoor ...
Light can be used to transmit data and analog signals. For example, lighting white LEDs can be used in systems assisting people to navigate in closed spaces while searching necessary rooms or objects. [103] Assistive listening devices in many theaters and similar spaces use arrays of infrared LEDs to send sound to listeners' receivers.
Punxsutawney Phil's stump door is seen in the pre-dawn hours of the 136th Groundhog Day, held annually to try to predict the end of winter, at Gobblers Knob in Punxsutawney, Pennsylvania, U.S ...
In Islam, Zodiacal Light (or "false dawn") is referred to as False Morning (Subhe-Kazeb, Persian ØµØ¨Ø Ú©Ø§Ø°Ø¨) and Astronomical dawn is called Sahar (سØر) or True Morning (Subhe-Sadeq, Persian ØµØ¨Ø ØµØ§Ø¯Ù‚), and it is the time of first prayer of the day, and the beginning of the daily fast during Ramadan.
The light scattered from extremely small dust particles is strongly forward scattering, although the zodiacal light actually extends all the way around the sky, hence it is brightest when observing at a small angle with the Sun. This is why it is most clearly visible near sunrise or sunset when the Sun is blocked, but the dust particles nearest ...
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