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REPORT ABUSIVE REPLY
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Message Subject
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The Sun Was Supposed To Set At 4:41 Central Time In Missouri, 12/18 , Still Hasn't Set At 5:01
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Poster Handle
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Dr. Astro |
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Post Content
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Normally I just read post here. I came across this thread yesterday and found it very interesting because I had noticed the same thing happening. At a time when the daylight should be less until the winter solstice, I noticed last week it seemed the daylight was getting longer, if only by a couple of minutes but it was. So I paid attention last night. The sun set about 15 minutes later than what it should have AND the civil twilight lasted until 6:15 pm. Here is when it should have ended.
U.S. Naval Observatory
Astronomical Applications Department
Sun and Moon Data for One Day
The following information is provided for Atlanta, Georgia (longitude W84.4, latitude N33.8):
Wednesday
19 December 2012 Eastern Standard Time
SUN
Begin civil twilight 7:10 a.m.
Sunrise 7:38 a.m.
Sun transit 12:35 p.m.
Sunset 5:32 p.m.
End civil twilight 6:00 p.m.
The last of the sun dropped below the horizon at approx 5:47 pm.
Quoting: WatcherJ " Sorry? You determined that, how? Uh, simple...do you even know the meaning of civil twilight you dweeb? if not then let me s'plain: Civil twilight is defined to begin in the morning, and to end in the evening when the center of the Sun is geometrically 6 degrees below the horizon. This is the limit at which twilight illumination is sufficient, under good weather conditions, for terrestrial objects to be clearly distinguished; at the beginning of morning civil twilight, or end of evening civil twilight, the horizon is clearly defined and the brightest stars are visible under good atmospheric conditions in the absence of moonlight or other illumination. In the morning before the beginning of civil twilight and in the evening after the end of civil twilight, artificial illumination is normally required to carry on ordinary outdoor activities. And before you even say it, no, it was not the moon "illuminating" the sky. The sky was still light from the sun setting. You see all, this guy is a shill. Hostile from the get-go. They are easy to spot. A few others are little more discrete. How did you measure the sun's altitude below the horizon? I don't care of you could or couldn't distinguish objects, the defined end of civil twilight is a function of the sun's geometric altitude below the horizon regardless of how much ambient light is present. The latter is a function of atmospheric refraction and conditions.
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