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like a slow child
that does not heed
i stand at summer's knees -
and from the primer of the wood
i spell that life and love are good -
i learn to read.
Infotainment - Racine, Wisconsin, USA
I didn't know I was grateful for such late-autumn bent-up cornfields yellow in the after-harvest sun before the cold plow turns it all over into never. I didn't know I would enter this music that translates the world back into dirt fields that have always called to me as if I were a thing come from the dirt, like a tuber, or like a needful boy. End Lonely days, I believe. End the exiled and unraveling strangeness.
Just getting caught up after my Florida trip. The last night I was there, I went out for sunset as I do many nights. Each night brings something a little different. Tuesday night's sunset showed off how Earth's atmosphere refracts sunlight and can distort its shape.
As sunlight passes through Earth's atmosphere, its path is bent thought a process called refraction. You have probably seen refraction before. It's the same process that causes a pencil to appear bent when it is partially submerged in a glass of water and the same process that your eyes (and glasses if needed) use to focus light. In the Sun's case, refraction causes the Sun to appear a little higher in the sky than it would if Earth had no atmosphere.
But the Sun is not a point source. Near sunset, light from the upper limb of the Sun passes through less atmosphere than light from the lower limb of the Sun. That means light from the lower limb of the Sun is shifted upward more than light from the top limb of the Sun. The upshot of this is that the Sun will appear to be squeezed vertically and appear much fatter the lower it gets in the sky.
This effect was pronounced on Tuesday. I took a bunch of my photos and put them into a short video. The pictures are not equally spaced in time (I tend to take pics more frequently as the Sun gets lower and a rapid burst near the end of sunset). You also may notice when I change camera settings due to the changing lighting conditions as the Sun sets. And you can look see some birds flying across some pics. Really watch the last frames and you can see the last tip of the setting Sun gets very stretched horizontally.
Tonight after sunet, I kept shooting some photos. Venus is becoming an evening object again and Mercury is putting in an appearance as well. It took some shooting, but I got both of them together in one shot (click to enbiggen).
Venus is near the top of the photo and Mercury is almost directly beneath it (offset a touch to the right). Mercury is very dim so look close.
These to planets are going to get much closer together and be about 2 degrees apart in early November and stay that close until about mid-November. Although they are very close together, they never have a true conjunction since they never have the same right ascension. It will still be a very scenic pairing that you can watch over the next couple of weeks. Mercury will get easier to see as it rises higher in the sky. Right now, it is definitely a test of your eyesight!
Reprinted with permission from the Half-Astrophysicist Blog.
I have posted a lot of pics of green flashes at Sunset (just enter green flash in the search box and you can find out all about them). However, not all flashes at sunset are green. I have photographed blue and purple flashes as well. Tonight, I added another color to the mix.
First, it was a nice omega sunset again. Here are a couple of shots.
The omega sunset occurs when an inferior mirage of the Sun appears to rise up from the horizon to meet the setting Sun. Hence, the resulting shape looks like the greek letter Ω.
Tonight the last little bit of the Sun set leaving behind the very tip of the inferior mirage and it was yellow. You can see this is not connected to the main image of the Sun. Sometimes these flashes are green, tonight I got a yellow flash.
Always watch, you never know what you are going to get!
Reprinted with permission from the Half-Astrophysicist Blog.
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