Stargazing U.S. Solar Eclipse of Aug. 21, 2017

[1oldman2]

Anyone have any tips on how to capture "low contrast" images with a camera?

Might try, http://www.cambridgeincolour.com/

 

[OmCheeto]

Might try, http://www.cambridgeincolour.com/

I checked.
I could not find a "How to photograph white cows in a blizzard" article, but did see that "UV filters" used to be used for that purpose. I still have all of my old "film" developing junk, and found a UV filter.
In the one article I read, it stated that digital cameras don't suffer from the "UV light confusing" the camera.
After taking a couple of images with and without the filter, I can't tell a difference.
I may have to read the manual for my camera. Please don't tell collinsmark. It's been over a year...

[edit: Nada. The camera has no special features in "movie" mode]

ps. That linked thread is actually a setup for my next question.

 

[1oldman2]

I know we have been over this before but this ones worth posting.
https://www.universetoday.com/136440/one-month-guide-total-solar-eclipse/

 

[jim hardy]

I read someplace that a #12 or #14 welder's helmet lens is a suitable filter.

Hasn't been easy finding a table of attenuation vs shade number
here's best i could do, from https://photo.stackexchange.com/que...-translate-to-stops-when-used-as-an-nd-filter

but the higher numbers are hard to find.

My guess from transmittance numbers is that two #10's together will be not far from a #14... for visible that is
transmittance of 0.0139 ^{^2} = 0.000193, which is 71% of a #14's nominal 0.00027
UV is better by an order or two of magnitude ?
so
I bought two pair of #10's, with tax they cost me about five bucks each

when get a minute will see what they do to the sun.

I figured it's safer than something home-made.
If there's a welding optics guy in the house i welcome corrections .

old jim

 

[OmCheeto]

I know we have been over this before but this ones worth posting.
https://www.universetoday.com/136440/one-month-guide-total-solar-eclipse/

That is seriously interesting.

"If you don’t think the danger is real, read this amazing recent interview with an optometrist on Space.com, where he states you can actually see the crescent Sun burned into the backs of patient’s eyes who stared too long at a partial solar eclipse (!) It’s a permanent souvenir you don’t want to have."​

But that brings up the question; "How long can you stare at the sun without getting a 'souvenir'?"

After some googling, it looks as though there have not been enough volunteers for such a study, but;

"Eclipse watching is the commonest cause of solar retinopathy..." [ref: British Journal of Ophthalmology]​

Sunglasses, stained or smoked glass, and old film negatives do not protect against retinal damage following deliberate observation of the sun. ​

 

[OmCheeto]

Ok. This looks like a reasonable answer.

"...read this amazing recent interview with an optometrist on Space.com"

While official recommendations by NASA and the American Astronomical society say you shouldn't look directly at the sun when any part of it is showing, experienced eclipse watchers like Chou say it's safe to remove your eclipse glasses during the 2-3 seconds before and after totality to see the so-called diamond ring effect, or "Baily's beads." During this phase of the eclipse, the light of the crescent sun forms points of light on the edge of the disk for just a few seconds.
​

 

[jim hardy]

when get a minute will see what they do to the sun.

Two #10's make the afternoon sun just a pale yellow circle in a black field. It's so dim as to be barely visible so i'll have to rig some sort of face shield to block light from the sides. I think i'll look at welder's helmets ...

One #10 is NOT enough .

old jim

Late entry

got a welding helmet with #10 lens. Another lens taped on should work, will try it tomorrow..

Hobart 770264 , $33 at Amazon $25 at Tractor Supply..

 

[anorlunda]

Uh oh. I just read this article about eclipse mania. They make it sound like this scene from the movie Contact.

It makes me fear that I may have seriously underestimated the logistics of seeing the totality. My wife and I are departing Vermont in the beginning of August for a 6 week car+tent tour of the US Northwest & Canada. The high point of the trip would be the eclipse. It is not our habit to plan anything in advance when we tour. We just follow our noses.

I thought loosely that if we went to any remote area of Wyoming or Idaho or Oregon that we would have clear skies with no crowds. I did not plan to find a camp site within the zone of totality. But I thought we might be able to tent within 100 miles of the zone, and then drive in for the event and drive out again before dark. But in the remote areas, highways are also scarce. The approach roads might be jammed solid, and one can't find a private place behind a bush to pee. In short, my planning might be woefully inadequate.

Counting only the American West. It seems like infinite wide open space, but not really. Let me do a little Drake equation.

There are about 5 billion square meters of surface in the totality zone within 1000 miles of the Pacific. Optimistically, 1% of that is is within 200 m of a road. Figure 5 square meters per person including their car and chairs. There is room for only 10 million people, whereas 100 million people might be interested. Ay ay ay, it may get very crowded indeed.

10 million people also need about 3 million toilet visits per hour. My wife and I are 72, we're no longer like Woodstock hippies.

One thing we won't do is to cancel. This is a chance of three lifetimes. I just hope that the news reports are greatly exaggerated.

Traffic will be a critical issue on eclipse day. Idaho is the closest destination for tens of millions of people from southern California, Arizona, Utah, and Montana.

 

[1oldman2]

After some googling, it looks as though there have not been enough volunteers for such a study, but;

Quoting from the article, it's no wonder volunteers have been in short supply. (You would think a trained psychologist would know better than staring at the Eclipse long enough to blind himself.)
"Don’t be like 18th century psychologist Gustav Fechner who blinded himself staring at the Sun, mesmerized by the glare of lingering afterimages."

 

[OmCheeto]

Uh oh. I just read this article about eclipse mania. They make it sound like this scene from the movie Contact.

View attachment 207584

If only it would be that peaceful. Just to be safe, I'm planning for a "Zombie Apocalypse":

It makes me fear that I may have seriously underestimated the logistics of seeing the totality.

This has been me, every day, for quite some time.
Just two weeks ago, I ran into a guy at our local renaissance faire. He was lugging around a $6000 camera/tripod setup. (He claimed the tripod cost more than his camera.)
After about 5 minutes of conversation, I asked him where he was going for the "Eclocalypse".
He said; "Fossil".
Which is where I was planning on being.

My wife and I are departing Vermont in the beginning of August for a 6 week car+tent tour of the US Northwest & Canada. The high point of the trip would be the eclipse. It is not our habit to plan anything in advance when we tour. We just follow our noses.

I thought loosely that if we went to any remote area of Wyoming or Idaho or Oregon that we would have clear skies with no crowds. I did not plan to find a camp site within the zone of totality. But I thought we might be able to tent within 100 miles of the zone, and then drive in for the event and drive out again before dark. But in the remote areas, highways are also scarce. The approach roads might be jammed solid, and one can't find a private place behind a bush to pee. In short, my planning might be woefully inadequate.

Counting only the American West. It seems like infinite wide open space, but not really. Let me do a little Drake equation.

There are about 5 billion square meters of surface in the totality zone within 1000 miles of the Pacific. Optimistically, 1% of that is is within 200 m of a road. Figure 5 square meters per person including their car and chairs. There is room for only 10 million people, whereas 100 million people might be interested. Ay ay ay, it may get very crowded indeed.

10 million people also need about 3 million toilet visits per hour. My wife and I are 72, we're no longer like Woodstock hippies.

View attachment 207585

One thing we won't do is to cancel. This is a chance of three lifetimes. I just hope that the news reports are greatly exaggerated.

One glimmer of light is that I've found a multi-thousand acre ranch very near where I wanted to be, and they are only charging $150 per person, for a Thursday-Monday camp spot, and they only have 268 followers on Facebook. Which makes me suspicious, that they might be Russian hackers.
http://www.mountaincreekeclipse2017.com/

But I'm still going to wait on the weather report. I just discovered yesterday that I'm only a 19 mile bicycle ride away from the edge of totality.

Furthest I'm willing to drive: 700 miles, Idaho Falls, Old Jim's place. Major cost: gas (≈$120)
Middling place I'm willing to drive to: Mitchell Oregon, 200 miles. Cost: Ehr mehr gerd. 5 days of supplies, with self supplied solar heating & cooling, etc... ≈$1000
Bicycling distance: 19 miles. Might have to get up and leave by 5 am. Cost: New inner tubes. (guessing $10)

[preemptive edit: Ehr mehr gerd...]



These [russian hacker] kids might have a media agent.
[/preemptive edit]

 

[Janus]

Just double checked, and our reservation in Lincoln City that we made back in early September is still good and for the same price as when we booked. Now its just a matter of good weather . (and no Hag fish spilled on the road. We spent three nights in Depoe Bay last week, and got caught in the traffic jam caused by that accident for better than an hour. If that wasn't bad enough, we were on a fairly steep incline and I have a stick shift. It was clutch and brake, clutch and brake the entire time.)

 

[OmCheeto]

Just double checked, and our reservation in Lincoln City that we made back in early September is still good and for the same price as when we booked. Now its just a matter of good weather . (and no Hag fish spilled on the road. We spent three nights in Depoe Bay last week, and got caught in the traffic jam caused by that accident for better than an hour. If that wasn't bad enough, we were on a fairly steep incline and I have a stick shift. It was clutch and brake, clutch and brake the entire time.)

My next door neighbors parents own a bar in Depoe Bay. I mentioned the "Hag Fish" incident to him yesterday, saying; "That reminded me of you!"

Good thing he has a sense of humour.

ps. My brother owns a house in Waldport, where he says he'll be for the eclipse, with my grand-nephew. It's on the VERY southern edge of totality, meaning; 1 second of totality...

I did some interpolative [aka bad] maths the other day, and it appears that eclipse durations are kind of like Einstein's Lorentzian mass maths:

All they have to do, is walk for an hour northward, and it will be... Wow...

Hopefully, my sister-in-law got my "Eclipses destroy Eyes!" message yesterday.
My brother, although well meaning, is, IMHO, a bit daft.

 

[OmCheeto]

If only it would be that peaceful. Just to be safe, I'm planning for a "Zombie Apocalypse":
...
[video of WWZombie]
...
http://www.mountaincreekeclipse2017.com/
[Mitchell! Oregon]
...
But I'm still going to wait on the weather report.

Just checked out the wiki entry on "Mitchell Oregon", trying to determine the average night time temperature[44 - 52°F. Bring warm night time clothing!], and saw this at the end:

In popular culture
In the novel World War Z[as in... Zombie!], by Max Brooks, the people of Mitchell are almost entirely infected and turned into zombies. Instead of being cleared, the town is sealed and is turned into the K-9 Urban Warfare school, where military dogs are trained with live zombies.​

ps. I've never actually seen the movie.

 

[Dr Transport]

My spot... I'll be driving home from Texas to see the eclipse...

 

[anorlunda]

View attachment 207630

My spot... I'll be driving home from Texas to see the eclipse...

The website that gave you numbers for the spot you clicked looks useful. Do you have a link for it?

 

[Dr Transport]

The website that gave you numbers for the spot you clicked looks useful. Do you have a link for it?

https://eclipse2017.nasa.gov/sites/default/files/interactive_map/index.html

 

[jim hardy]

My spot...

That's likely near where i'll wind up. That's only a three hour drive for me.
Things are just not falling into place for a run way out west, family complications ...

Tried my welder's helmet on the noonday sun. It has a #10 lens and i just duct-taped another #10 in front of it. Sun is a nice yellow disc .
Helmet needs a blocking cloth in back , ambient light makes reflections on inside of lens..

 

[1oldman2]

This would have to be one of the premium viewing sites in the country, note the Earthquake detail.
https://en.wikipedia.org/wiki/Borah_Peak

https://www.greatamericaneclipse.com/idaho/
http://www.idahoaclimbingguide.com/bookupdates/mount-borah-12655/
https://upload.wikimedia.org/wikipe...D_view.webm/Borah_Peak_ID_view.webm.480p.webm
For those of you Statistically inclined.
https://www.greatamericaneclipse.com/statistics/

 

[mfb]

For those of you Statistically inclined.
https://www.greatamericaneclipse.com/statistics/

I expect that this site underestimates the number of visitors, especially in the west, far away from the 2024 eclipse path:

Based on this profile of an average person living 200 miles away, I estimate that this population has a high probability of 2% to drive into the path of totality and a low probability of 0.5%.

 

[1oldman2]

I expect that this site underestimates the number of visitors, especially in the west, far away from the 2024 eclipse path:

I believe the "stat" page I linked was only concerned with the event on the 21st, The 2024 show will be "Full House" over almost it's entire path due to the populated area it's covering, vastly different demographics from this years Eclipse. I have Family in both Lincoln City, Oregon and Thermopolis, Wyoming, after seeing the odds of favorable weather at both locations I've decided on being a little south of Thermopolis unless the weather goes to hell. Contingency spot is Mt. Borah, although my wife and I have hiked that area many times we won't be trying the peak due to her health. (Isn't it ironic how the edge of the Eclipse just brushes the northern part of "Craters of the moon".

 

[OmCheeto]

This would have to be one of the premium viewing sites in the country, note the Earthquake detail.
...
https://upload.wikimedia.org/wikipe...D_view.webm/Borah_Peak_ID_view.webm.480p.webm
...

Twas a similar video of Mt. Jefferson, that made me sad I'm so old.

April 12, 2016
...it made me want to hike to the top of Mt. Jefferson ( 44°40'48" N 121°17'56W, elevation 10,500 feet), which is only 100 miles away, and almost directly in the path.

I was actually devising plans of buying bolt cutters to get through forestry service gates, camping at just below the peak the night before, etc, etc. Fortunately, the logistical problems nipped that idea in the butt.

 

[1oldman2]

I was actually devising plans of buying bolt cutters to get through forestry service gates,

Most people just hook on a stout chain and take off in low gear. (Not that I'm advocating vandalism of forest service gates) Actually the best hiking is behind those gates due to the lack of traffic.

that made me sad I'm so old.

Don't get me started.
All said that Mt. Jefferson looks awesome.

 

[OmCheeto]

Most people just hook on a stout chain and take off in low gear. (Not that I'm advocating vandalism of forest service gates) Actually the best hiking is behind those gates due to the lack of traffic.

Don't get me started.
All said that Mt. Jefferson looks awesome.

Just found another video of climbing the mountain made around this time last year.

Ehr mehr gerd...



Near the end, you can see it's "above the clouds".

Love his quote at the end; "If you want to experience fantastic things, you need to put yourself, in fantastic places."

 

[mfb]

I believe the "stat" page I linked was only concerned with the event on the 21st

Sure, and I think they underestimate the number of people interested in it.

I mentioned the 2024 eclipse because someone close to the line of totality then has a smaller incentive to see the eclipse next month.

 

[BillTre]

I was reading an article about photographing the eclipse that pointed out the following:

If you are at a relatively high vantage point, you might be able to see the shadow of the moon as it is sweeping across lower areas, before and after the eclipse occurs at your specific location.
I would like to make a video of this but I feel I will be lucky to find such a high vantage place since they are not obvious on maps.
Maybe a butte or cliff next to a river.

 

[mfb]

You can observe the same effect, but a bit less spectacular, if you are at a low point but have mountains nearby. Several kilometers of view are advisable, but that doesn't need a proper mountain, many hills work.

 

[BillTre]

This links to a video, from space, of the shadow of the moon, on the earth, during a recent eclipse.

 

[1oldman2]

I hadn't noticed the "Mercury aspect" of this project.
https://www.nasa.gov/feature/goddard/2017/chasing-the-total-solar-eclipse-from-nasa-s-wb-57f-jets
"Observations of Mercury will also be taken a half-hour before and after totality, when the sky is still relatively dark. These images, taken in the infrared, will be the first attempt to map the variation of temperature across the surface of the planet.
The images of the corona will also allow the team to search for a hypothesized family of asteroids called vulcanoids. Its thought these objects orbit between the Sun and Mercury, and are leftover from the formation of the solar system. If discovered, vulcanoids could change what scientists understand about planet formation."

 

[OmCheeto]

I hadn't noticed the "Mercury aspect" of this project.
https://www.nasa.gov/feature/goddard/2017/chasing-the-total-solar-eclipse-from-nasa-s-wb-57f-jets
"Observations of Mercury will also be taken a half-hour before and after totality, when the sky is still relatively dark. These images, taken in the infrared, will be the first attempt to map the variation of temperature across the surface of the planet.
The images of the corona will also allow the team to search for a hypothesized family of asteroids called vulcanoids. Its thought these objects orbit between the Sun and Mercury, and are leftover from the formation of the solar system. If discovered, vulcanoids could change what scientists understand about planet formation."

Vulcanoids?

Oh good grief, ain't nobody got time to be looking for "oh, and bye the way, can you look for these hypothetical thingys?"

Unless of course, someone can point me to a "one-size-fits-all" camera that will fit on my 3" telescope, that costs less than $200, and if it would even be worth it.
I'm a tad over budget this year.

ps. I am so tired of "eclipse maths"...
Yesterday I worked out the "If my brother owns a house at the coast, 2 miles from the edge of the total eclipse, should I go there, and what's the value added by walking for an hour in the correct direction?" maths problem, given that I think I can walk at 2 mph.

Given that it is "now" eclipse time, and it is quite hazy here, I think I should get ready for a road trip, in the opposite direction.

 

[OmCheeto]

I got invited to the river two days ago, for the "sole" purpose of discussing the eclipse.
Of the 8 hours I was there, we discussed the eclipse for maybe 10 minutes.
One of my friends, 6 years my senior, said she was at Maryhill WA, and didn't think it was that big a deal.

After looking at videos from the period, I can understand why.



Do not take drugs before the eclipse. They will make you stoopid, and dance like a hippie, and miss the whole thing.

ps. Young peeps, never ever ask old people about the "70's"...

 

[mfb]

This links to a video, from space, of the shadow of the moon, on the earth, during a recent eclipse.

Watch the video and try to visualize that it is the Earth that rotates, while the Sun stays in the same direction.

 

[1oldman2]

said she was at Maryhill WA, and didn't think it was that big a deal.

Some folks just have no appreciation for celestial mechanics.

After looking at videos from the period, I can understand why.

Here is one that will be more "in tune"

Do not take drugs before the eclipse. They will make you stoopid, and dance like a hippie, and miss the whole thing.

It will also likely lead to...

ps. Young peeps, never ever ask old people about the "70's"...

Also "That 70's show" isn't a reliable source of information.

Given that it is "now" eclipse time, and it is quite hazy here, I think I should get ready for a road trip, in the opposite direction.

Good call, John Day seems like a better bet. Just "Head East" until you don't see anymore Banana Slugs, they are a reliable climate indicator.

 

[1oldman2]

Vulcanoids?

Oh good grief, ain't nobody got time to be looking for "oh, and bye the way, can you look for these hypothetical thingys?"

Page 128 tells a pretty good story about that.
https://ia801902.us.archive.org/7/i...ventsfor2017/101AstronomicalEventsfor2017.pdf

 

[1oldman2]

This http://eclipse.montana.edu/ is a pretty cool take on a project done in Oz during the 2012 Eclipse.
"Taken from a high-altitude balloon, it shows Australia’s Nov. 14, 2012 total solar eclipse as seen from 37,000 meters (120,000+ feet, nearly 23 miles) above the Earth"

 

[OmCheeto]

Some folks just have no appreciation for celestial mechanics.

It took me awhile, but it appears that she was fogged in.

We could see across the way to Goldendale Washington where the observatory was broadcasting on NBC news and where a huge crowd had gathered as a huge cloud condensed out of the cooling air and settled in right over the observatory. We could see I-84 along the Columbia River fill up with cars stopped bumper to bumper, fog forming over them. [ref]​

Here is one that will be more "in tune"


It will also likely lead to...

Those two songs, along with my signature song, seem to have been inspired by eclipses.

"The Word"

This garden universe vibrates complete.
Some we get a sound so sweet.
Vibrations reach on up to become light,
And then thru gamma, out of sight.
Between the eyes and ears there lay,
The sounds of colour and the light of a sigh.
And to hear the sun, what a thing to believe.
But it's all around if we could but perceive.
To know ultra-violet, infrared and X-rays,
Beauty to find in so many ways.
Two notes of the chord, that's our fluoroscope.
But to reach the chord is our lifes hope.
And to name the chord is important to some.
So they give a word, and the word is OM.​

"OM"

The rain is on the roof
Hurry high butterfly
As clouds roll past my head
I know why the skys all cry
OM, OM, Heaven, OM

The Earth turns slowly round
Far away the distant sound
Is with us everyday
Can you hear what it say
OM, OM, Heaven, OM

[watch the eclipse musical interlude]

The rain is on the roof
Hurry high butterfly
As clouds roll past my head
I know why the skys all cry
OM, OM, Heaven, OM​

[insert Archimedean Spiral images from the end of the video, my driveway, and FB post]​

I'm guessing that "I know why the skys all cry" is euphemism for; "I know why these guys all cry", as they were not in right place, at the right time.
And "Hurry high butterfly", is an image of the corona.

A hmmm... This is the way my brain works.

Also "That 70's show" isn't a reliable source of information.

Never watched it. (Ok. Maybe once, but just to confirm that people who lived through it, didn't really remember it.)

Good call, John Day seems like a better bet. Just "Head East" until you don't see anymore Banana Slugs, they are a reliable climate indicator.

ps. Have done tons of preliminary experimenting over the last two weeks.

I've decided against the 500 & 1000 lines per millimeter diffraction grating, and opted for a 200 lines/mm glass "Woo woo. Rainbows!" lens I found in an old box.

 

[1oldman2]

It took me awhile, but it appears that she was fogged in.

Ahh, the coastal curse.

A hmmm... This is the way my brain works.

Interesting, I never would have made the Moody Blues connection.

Never watched it. (Ok. Maybe once, but just to confirm that people who lived through it, didn't really remember it.)

Same here, I don't have patience enough to relive that one.

 

[Borg]

This is a nice link that I found yesterday. It shows the path of totality on the map. By clicking on the map, it pops up a table showing the times when the eclipse and its totality begin and end.
http://xjubier.free.fr/en/site_pages/solar_eclipses/TSE_2017_GoogleMapFull.html

CAUTION for reading times in the table: The times are given in UTC which is centered in England. There is a timezone display option on the left of the screen that shows the UTC correction for the point that you selected. However, it doesn't change the displayed times in the table. For those who don't know UTC, the tables in Oregon will show max eclipse times from 17:16 to 17:26. This is 12:16 to 12:26 LOCAL time.

 

[anorlunda]

Here's a question that may be difficult to answer. I've been desparately trying to find a place to watch the eclipse, that is not overrun by crowds. A friend invited me to watch at his house near Bend, OR. But he warned me that the country road near his house is expected to be overwhelmed by 500,000 people in the 20 miles between his house and the eclipse centerline. Therefore, he is unwilling to go even one mile closer because of the horror scene.

The NASA site says that his house will experience 99.97% occlusion. My question: will I be able to see the sun's corona with that 99.97%?

 

[mfb]

0.03% of the sunlight corresponds to mag -18, while the corona seems to have a similar brightness as the full moon, about mag -8. The brightness contrast would be similar to a star directly next to the full moon, and worse than Jupiter's moons compared to Jupiter (two of them are easily bright enough for the human eye - but you don't see them because Jupiter is too bright and too close).

To make it worse, the brightness of the sky will still be significant. It might outshine the corona, even if you can block the spot of direct sunlight.

Doesn't sound promising.

 

[tony873004]

My question: will I be able to see the sun's corona with that 99.97%?

My guess is yes based on watching some Youtubes where people are shouting "Corona!" during the Diamond Ring. But that 0.03% giving you the Diamond Ring is still bright photosphere, and you are heavily discouraged from viewing it without a filter. And with a filter, you won't see the corona. So you'll be breaking everyone's safety advice by trying. Besides, the view of the corona will be much better with the photosphere completely blocked out. The amount of time you can see the corona will be greatly extended if you can complete the final 20 miles.

With 20 miles to the centerline, your friend must be closer to Redmond than Bend. 20 miles from centerline is in the path of totality.

Here's a simulation I made of the view from Bend. Find your friend's Latitude and Longitude and change it. Every 0.1 degrees more in latitude is about 7 miles. Notice how vastly the sky is improved by juat adding 0.1 degrees to latitude. Keep in mind this simulation is simply my guess as to what it will look like based on 2 total eclipses I have seen (but rained out) and 3 annular eclipses.

http://orbitsimulator.com/gravitySimulatorCloud/simulations/1501885903145_eclipseBend.html

 

[anorlunda]

Here's a simulation I made of the view from Bend.

That's awesome. Thank you. I'll let you know how it turns out.

 

[OmCheeto]

My guess is yes based on watching some Youtubes where people are shouting "Corona!" during the Diamond Ring. But that 0.03% giving you the Diamond Ring is still bright photosphere, and you are heavily discouraged from viewing it without a filter. And with a filter, you won't see the corona. So you'll be breaking everyone's safety advice by trying. Besides, the view of the corona will be much better with the photosphere completely blocked out. The amount of time you can see the corona will be greatly extended if you can complete the final 20 miles.

With 20 miles to the centerline, your friend must be closer to Redmond than Bend. 20 miles from centerline is in the path of totality.

Here's a simulation I made of the view from Bend. Find your friend's Latitude and Longitude and change it. Every 0.1 degrees more in latitude is about 7 miles. Notice how vastly the sky is improved by juat adding 0.1 degrees to latitude. Keep in mind this simulation is simply my guess as to what it will look like based on 2 total eclipses I have seen (but rained out) and 3 annular eclipses.

http://orbitsimulator.com/gravitySimulatorCloud/simulations/1501885903145_eclipseBend.html

I have a feeling that someone didn't like my "info-graphic" that I posted on FB last week.

Which is probably a good thing, as now that I think about it, it is still a crumby explanation.

 

[russ_watters]

Eclipse test shot, taken with a Canon EOS T3i on a focal reduced Explore Scientific 127CF, at about 710mm focal length.

Full resolution, but cropped image available here:
http://www.russsscope.net/images/The-Sun-8-5-2017.jpg

How far out from the sun does the corona typically get? I'm thinking I might need a little less focal length...

 

[OmCheeto]

...

How far out from the sun does the corona typically get? I'm thinking I might need a little less focal length...

From May:

Look at the pictures on Miloslav Druckmüller's site.
http://www.zam.fme.vutbr.cz/~druck/Eclipse/Ecl2016i/0-info.htm
This will give you a very good idea as to how to frame your image. His images are created from bracketed images, so you get a dynamic range closer to what the human eye sees.

From the second corona image, it appears to extend beyond 3 moon diameters.

Though, if you read closely, this requires "bracketing", and special software.
The above image is a composite of 34 images, with exposure lengths from 1/1000 to 8 seconds.

This Druckmüller fellow is a pretty good source. From his home page;

Solar eclipse photography if one of the most difficult tasks of astronomical photography. There are at least three reasons for that. The first and main one is the extreme contrast which makes impossible to record the phenomenon on a single image. Neither classical nor digital photography have the ability to master the brightness ratio which is necessary for successful eclipse photography. The second reason is little chance for making experiments. If anything gets wrong it may take years to get an opportunity for a new experiment. The last but not the least reason is the fact that processing of images taken during total eclipse is very complicated and time consuming work with needs of one purpose software being developed specially for this aim.​

 

[OmCheeto]

Was just snooping around on the website of the town I plan on staying at for the eclipse, and saw the following URL snippet:
...ww.radio.cz/…/czech-scientific-team-prepares-for-mo…

I thought; "What a strange coincidence, that's where that fellow I just mentioned on PF is from. I wonder..."

CZECH SCIENTIFIC TEAM PREPARES FOR MOST DEMANDING TOTAL ECLIPSE OF THE SUN
03-08-2017

...
The team is headed by Miloslav Druckmϋller and Jana Hoderová.

The expedition team of around 30, composed both of members from Brno university and Institute of Astronomy of the University of Hawaii, will take up positions at a series of locations across the west of the United States. In fact, positions will be taken at five points in four states.

The crucial one will be at Mitchell, Oregon, where the conditions are expected to be at their best. And one of the sites there will be Whiskey Mountain...​

I plan on camping just 5 minutes from Mitchell. Odd to think I might actually meet him. Though, Whiskey Mountain is a 150 mile drive from Mitchell, so maybe not.

 

[Stavros Kiri]

A) With eclipse only a few days away (~2wks), it might be a good idea, especially for those studying eclipse related and/or other phenomena or issues during the eclipse etc., to have an idea about current solar events etc.

For updates and point of reference e.g. see:

https://www.spaceweatherlive.com/en/solar-activity/sunspot-regions

https://www.spaceweatherlive.com/en/solar-activity/solar-flares
(etc.)

+ http://www.swpc.noaa.gov/

For example, there is [still] currently a sunspot group (2670), that came from group AR2665 (renamed). There was a thread recently by @davenn:
https://www.physicsforums.com/threads/the-sun-today-9-july-2017-nice-spot-group.919696/

For a brief summary of the history of that latest (still active) sunspot region see also e.g. :
https://www.physicsforums.com/threa...17-nice-spot-group.919696/page-2#post-5815545

B) Also, isn't it time to start looking at regional weather reports?

 

[1oldman2]

At this point it's probably just space filler but you have to admit this is a pretty cool Eclipse shot.

 

[OmCheeto]

This is an interesting interview of the two people who run the GreatAmericanEclipse.com website.

We Asked Two Eclipse Chasers What Keeps Them Hooked
AUG. 8, 2017 AT 12:51 PM

My favorite comment:

Zeiler: "On a scale of 1 to 10, a partial solar eclipse is probably a 3.​

... A total solar eclipse has got to be a least a 1,000 [on a scale of 1 to 10]"

So many of my friends seem to be fine with 99%, and no amount of picto-graphics that I generate, has changed anyones mind.
Oh well. Less traffic for me.

 

[russ_watters]

Some folks just have no appreciation for celestial mechanics.

Here is one that will be more "in tune"


It will also likely lead to...

Ehem...great way to get totally into Eclipse mode:

 

[1oldman2]

B) Also, isn't it time to start looking at regional weather reports?

This is where I'll be catching the show, looks real good as long as the showers on the 22nd don't show up early. (10 day forecasts )