High-speed threading
of a high-altitude needle
I was walking by Lowell Elementary in Seattle when I took notice of a diffuse solar halo. I took a couple of shots of that, and then noticed the contrail that was being left by a plane directly under the Sun. I could see the offset shadow that the plane was casting, so I quickly made three more images.
These are simply referred to as contrail shadows on Les Cowley's Atmospheric Optics site: "Like other clouds, contrails cast shadows. These shadows fall on a thin, lower layer of cirrus cloud. We see the shadow from the other side of the layer, like looking through the back of a screen."
For the record, the photos were taken at 2:48~2:50 p.m., Aug. 15, in Seattle. The Sun was at 49 degrees(?).
These are simply referred to as contrail shadows on Les Cowley's Atmospheric Optics site: "Like other clouds, contrails cast shadows. These shadows fall on a thin, lower layer of cirrus cloud. We see the shadow from the other side of the layer, like looking through the back of a screen."
For the record, the photos were taken at 2:48~2:50 p.m., Aug. 15, in Seattle. The Sun was at 49 degrees(?).
High-speed threading
of a high-altitude needle
mr damon, 19:47
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