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March 30, 2001

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Figure 1

What is this guide line forming near the contrail? 

Answer: The black line near the contrail is the shadow of the contrail reflecting on a thin haze of clouds below it.  The angle of the reflection only makes it appear as though the shadow is above the contrail but it is not. (digital photograph)

Compare to images at:

http://tracers.8m.com/tracers.html - Pictures titled "The Black Line Mystery....

Shadow -- Guide Line -- Object Trail?"

http://www.sightings.com/general2/blackline.htm 

 

Figure 2

Close-up image of the contrail and it's shadow as they drift across the sky.

Answer: A contrail and it's shadow.

Figure 3

Another close-up as the contrail drifts across the sky.

Answer: A contrail and it's shadow.

Figure 4

Image of crossed contrails with shadows (top of school building with emergency siren  below the contrails).

2000 A. Hebert

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are copyrighted material and may not be copied or printed without prior permission from A. Hebert.