The picture, taken near Ajo, Arizona is a multiple exposure, each shot taken ten days apart, at 8:30 AM for a year. The sun's seasonal shift forms this figure 8, known as the analemma. Because of this effect, sundials can run ahead of clock time by as much as 16 mins 33 secs or fall behind by as much as 14 mins 6 secs.
When I saw this picture, it reminded me of an elderly gentleman named L. Gordon Plummer. He was retired, but volunteered time to come into my sixth grade class and teach us physics once per week. He'd teach us interesting things like basic concepts in relativity and quantum mechanics, or about hyper-cubes (four-dimensional objects). He invented a sundial that is always correct, by incorporating an analemma-shaped object into the design. It's still standing (I think) in Balboa Park in San Diego. I'm sure he's passed on long ago now. He was an interesting person, one that made an impact on me.
Retired accountant David Carrick installed a camera in the nest of a pair of eagles while they were away on their annual migration. Last week, the eagles laid two eggs that are expected to hatch by the end of the month.
Cool photographs by Don Ellis. Many subjects including nature ones, including this of a praying mantis.
Beautiful pictures of the Northern Lights.
Cool nature pictures by Tim Flach, including this one of a frog.
Great nature pictures.
Parasitic Wasp. When it's ready to lay eggs, the wasp finds itself a cockroach. It stings the roach such that the roach's front legs are briefly paralyzed so the wasp can continue without struggles. The wasp then delivers a very precise sting into the roaches brain such that it's escape reflex is disabled. Now the wasp leads the cockroach by it's antenna, and the cockroach calmly follows.
Actual pictures of snowflakes. Very cool.
The eternal Ansel Adams
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