And what country can preserve its liberties if their rulers are not warned from time to time that their people preserve the spirit of resistance? Let them take arms. The remedy is to set them right as to facts, pardon and pacify them. What signify a few lives lost in a century or two? The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.
Tuesday, November 19, 2013
Earth's approaching shadow visible at twilight.
Via APOD, from central Australia, this serene 360 degree panorama follows a clear horizon as twilight began on May 28. At left, a bright western sky is still illuminated by the setting Sun. But sweeping right, toward a view centered on the countryside's dominating sandstone Ayers Rock, the sky takes on progressively darker hues and subtle colors. Behind is the shadow of planet Earth itself, a dark blue arch rising in the east. Cast through the dense atmosphere and still close to the horizon, Earth's long shadow is bounded above by a pinkish glow or antitwilight arch. Known as the Belt of Venus, the lovely color of the antitwilight arch is due to backscattering of reddened light from the setting Sun.
I have never seen this. Now I'm going to have to constantly look for the shadow.
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Never heard of this phenomenon, but I will now be constantly searching, too. Thanks. :-)
ReplyDeleteI think we'll need to find a spot where it's flat to the horizon to maximize our chances. The midwest plains states would seem to be near to perfect
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