[ARC5] Blackout ; Lend Lease and ARC-5's (OT)

[Kenneth G. Gordon]

On 8 Jul 2012 at 8:53, J. Forster wrote:

> This is basically correct, but ignores scattering.

Exactly! And this is what is paramount: city glow, not direct lighting.
 
> Any light emitted in a direction above the horizontal gets scattered
> by the atmosphere and especially dust and other particles. Modern
> cities are visible by the glow in the night sky.

As German submarine crews discovered, or knew about...
 
> You don't need a direct line-of-sight.
> 
> In fact, it is very difficult to see the night sky anywhere along the
> east coast.

Or anywhere within 100 miles of any city of any size...

Ken W7EKB