cwnl:
Venus by the Sea
Venus sparkles like a diamond over the Rio de la Plata near Buenos Aires, Argentina. The Rio de la Plata is an estuary of the Parana and Uruguay Rivers. It’s so large (125 miles, or 200 kilometers from shore to shore) that some geologists consider the Rio de la Plata to be not a river mouth, but a marginal sea. The lights of Buenos Aires are visible in the far right of this May 28, 2011 photo.
Credit: Luis Argerich
cwnl:
The Majestic Circumzenithal Arcs
The circumzenithal arc, CZA, is the most beautiful of all the halos. The first sighting is always a surprise, an ethereal rainbow fled from its watery origins and wrapped improbably about the zenith. It is often described as an “upside down rainbow” by first timers. Someone also charmingly likened it to “a grin in the sky”.
Look straight up near to the zenith when the sun if fairly low and especially if sundogs are visible. The centre of the bow always sunwards and red is on the outside.
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