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This week while I was flying a search and rescue mission with the Civil
Air Patrol, our plane (a single engine, high-wing Cessna 172) made a
nice glory on the ground. We were flying at an altitude of 1200 to 1500
feet above sea level which meant that we were even closer to the ground
than that most of the time. It was the first time I had been in a plane
that made a glory on the ground rather on the tops of the clouds.
The interesting thing that I noticed was that the brightness of the glory
increased as it passed over *lighter* color terrain. I was expecting it
to be brighter over darker terrain because my logic was that the bright
"light" of the glory would show up more against a dark "background."
This difference in the "brightness" of the glory is probably not noticed
as much when they are projected on the cloud tops because the clouds are
more of a uniform color.
Does anyone have an explanation for why the glory was brighter when it
was projected onto lighter color terrain?
James Lowery
Birmingham, Alabama, USA
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