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originally posted by: Arbitrageur
So forget the idea 0.1 degrees for refraction is some kind of maximum, it's not. "typical" does not mean "maximum" and you are using an atypical example, a record-setting photograph at a distance of 443km.
The temperature gradient can make a difference and there's even a name for being able to see distant coastlines or objects we can't normally see, called the Novaya Zemlya effect. Whether something like that was a factor in the 443km photo, I don't know, but one could find out by comparing multiple photos taken from the same vantage point over the various seasons of the year, to look for variation in the images.
originally posted by: DaRAGE
originally posted by: Arbitrageur
So forget the idea 0.1 degrees for refraction is some kind of maximum, it's not. "typical" does not mean "maximum" and you are using an atypical example, a record-setting photograph at a distance of 443km.
Not to mention they had to have the cold fresh air blowing in from Greenland to make that happen.
Apart from the image of the Sun, the effect can also elevate the image of other objects above the horizon, such as coastlines which are normally invisible due to their distance. After studying the Saga of Erik the Red, Waldemar Lehn concluded that the effect may have aided the Vikings in their discovery of Iceland and Greenland, which are not visible from the mainland under normal atmospheric conditions.
originally posted by: cooperton
a reply to: WhatItIs
The people at the news station went and tested it themselves and saw the same image. It's not phenomenal refraction, it's just the way it is.
.
On a normal sunny day, say in summer you can only see a dozen or so of Chicago’s tallest buildings from southwest Michigan. Yes, you can see Chicago, just not all of it.
“Anything more than that, especially when you get above 10 or 12, something's happening, because that's not usually there," Nowicki said.
That something is a strong temperature inversion, warmer air above colder air, that causes light to bend.
www.abc57.com...
The views along the lake are always changing, along with the weather.
“I do go out and take a lot of photos of Chicago along the lake. I go to different locations on different nights. I like to compare the photos as to what's changed. Are the buildings wider, taller, shorter are there more of them? Less of them? It's always different, it's so unpredictable, I want to catch as many different views of it as I can," Nowicki said.
To those that doubt affects of refraction. The full Chicago skyline should be visible all the time if it weren't the case, barring clouds, rain or fog. However that’s not the case, it is always changing. I encourage anyone to go look for themselves.
www.abc57.com...
originally posted by: Arbitrageur
...typically only increases the observed elevation angle by less than 0.1°. That doesn't mean you can never ever find exceptions to the 0.1 degrees, in the same way saying people typically take over 5 minutes to run a mile doesn't mean you can't find exceptions to that.
The source also says the more atmosphere the light passes through the more refraction can be experienced, and you pick an atypical case, a record setting photograph at a distance of 443 km so the record setting photo itself is not a typical case.
So how much more refraction can occor when the light passes through more atmosphere? The same tchester.org site mentions that refraction from the sun can be up to 0.5 degrees because sunlight passes through more atmosphere, and in fact the sun can be seen when its true position is below the horizon for that reason:
originally posted by: WhatItIs
'The people at the news station went and tested it themselves and saw the same image. It's not phenomenal refraction, it's just the way it is.'
Another verifiable lie.
I posted something repeatedly. It’s from the “news station” you just seem to think is credible…
originally posted by: cooperton
[
www.abc57.com...
"UPDATE: We went back to the dunes in April of 2016 with photographer Joshua Nowicki and saw similar phenomena. "
It's not a mirage, it's just the way it is.
A picture of the Chicago skyline taken almost 60 miles away, is actually a mirage. Joshua Nowicki (@StartVisiting) snapped the pic Tuesday night from Grand Mere State Park in Stevensville. Under normal conditions, even when extremely clear, this should not be visible, due to the curvature of the earth. The Chicago skyline is physically below the horizon form that vantage point, but the image of the skyline can be seen above it.
This is a form of Superior Mirage, superior in this meaning the mirage or image of the skyline is seen above where it's actually located. The clear skies, and cool weather (aided even more by the cool lake water) creates an inversion. A layer of air near the surface that's cooler than air higher in the atmosphere. This creates a bending or ducting effect where the light (image) instead of going in a normal straight line into space, curves back towards the surface of the earth.
This same phenomena can also be seen on the radar in the form of "ground clutter" the inversion is taking the radar beam (light) and bending back towards the surface of the earth, creating a "ring" effect.
UPDATE: We went back to the dunes in April of 2016 with photographer Joshua Nowicki and saw similar phenomena. We explain the science of atmospheric refraction ( mirage and looming) Watch our Emmy nominated piece Skyline Skepticism here.
www.abc57.com...
Skyline Skepticism: The Lake Michigan Mirage
www.abc57.com...
“I do go out and take a lot of photos of Chicago along the lake. I go to different locations on different nights. I like to compare the photos as to what's changed. Are the buildings wider, taller, shorter are there more of them? Less of them? It's always different, it's so unpredictable, I want to catch as many different views of it as I can," Nowicki said.
To those that doubt affects of refraction. The full Chicago skyline should be visible all the time if it weren't the case, barring clouds, rain or fog. However that’s not the case, it is always changing. I encourage anyone to go look for themselves.
The source site I posted tchester.org has all kinds of math. He mentions less than 15% of the earth's curvature at the following link, but he is thinking 200 km or less, not 443 km. So you only have to get from his 15% to 20% which is not hard given all the variables over a 443km distance and the fact that 443km is a much longer distance than he is talking about:
originally posted by: cooperton
Show mathematically how you could get refraction that alters the path by over 20%.
Note that this calculation assumes quite a bit. The real atmosphere can vary markedly horizontally, can have temperature inversions, can change its humidity, and have additional components like dust that change the index of refraction. The observer and observed peak are not always at the same elevation assumed in the derivation of this formula. Hence there are no guarantees that this formula will always give accurate results.
Showing other examples with shorter distances doesn't make the 443 km record breaking distance typical, the fact that it's record-breaking makes it atypical by definition. Even in the other examples, we can see the atmospheric conditions are not static and refraction can vary with conditions so a fixed formula is not going to give the correct amount of refraction all the time.
It's not atypical. There are many pictures that defy the curve:
I have composed a few images that prove curvature on the original image beyond doubt. (I even used Mick's Google Earth trick in the first of them). The first two show how you are looking "through" the earth to the sea level at the points under the distant peaks, while the third one proves that the earth calculator is correct.
originally posted by: Arbitrageur
The source site I posted tchester.org has all kinds of math. He mentions less than 15% of the earth's curvature at the following link, but he is thinking 200 km or less, not 443 km. So you only have to get from his 15% to 20% which is not hard given all the variables over a 443km distance and the fact that 443km is a much longer distance than he is talking about
That shows it can't match the flat earth model, only the globe model.
originally posted by: cooperton
It still wouldn't be visible at 20%. You'd need significantly more refraction than 20% to exhibit what is observed
The following video explains further with words, images and mathematical calculations why the 443km image you say shows the earth is flat actually proves it's curved!
I can make a diagram next time I'm at my laptop, using just words may be insufficient to make my point
The Guinness World Record holding photograph by Mark Bret is often cited by Flat Earthers of proof that the Earth can't be curved, but if you actually break the image down, it proves the existence of curvature