Odd dark streak in the blue sky

Dark streak in blue sky

I was at Carkeek park on Wednesday 3-12-09 and saw this dark streak in the blue sky

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r_photo says ... on Sunday, Mar 15 at 6:29 AM

These dark streaks are caused by jet contrails casting shadows through atmospheric haze. You can't really see them unless you're positioned to view them from just the right angle, so they are a fairly uncommon sight.

suzhastings says ... on Sunday, Mar 15 at 8:49 AM

That's a very interesting phenomenon.

Anonymous says ... on Sunday, Oct 3 at 3:05 PM

I think they are angels.

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