Abstract:Naked eye observations of morning twilight phenomenon at Hail and other areas of Saudi Arabia are recorded. During the interval from 2014 to 2015, about 80 morning twilight observations were carried out in Hail at longitude λ = 41°42′E and latitude φ = 27°31′N for a desert background. The phenomena was followed over azimuth angles ranged from 0°to 20°of solar vertical direction and from 0°to 10°along the altitudinal range. By selecting 32 days with a very good visibility, it was found that Sun depression, D o … Show more
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