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PostPosted: Mon Aug 21, 2017 1:05 pm
 


Thanks, I really appreciate that.


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PostPosted: Mon Aug 21, 2017 1:06 pm
 


Hyack wrote:
I went down to Sapperton Landing this morning, had the #12 lenses and put together a small pinhole camera. Both worked out okay, but even with the Sun 90% eclipsed I could hardly see the difference......a nice place to be and overall a nice day but, as for the eclipse.....it was basically a bust! :cry:

That's something I read but did not expect! Things became a little dimmer, but it was like there was a thin mist over the city, got barely darker even with almost 70% coverage.


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PostPosted: Mon Aug 21, 2017 1:16 pm
 


Yeah. I think it was supposed to be 86% coverage around here but it may as well have been a slightly translucent cloud for all the difference in brightness that resulted.

Oh well. I'm still happy I got to see some of it.


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PostPosted: Mon Aug 21, 2017 1:50 pm
 


BartSimpson wrote:

Hate to say but we're hitting a rough patch after 30 years.

In any case, here's one of the best shots from the phone of what we saw here in Sacto:


Sorry to hear that Bart. After 30 years must be a bit of a stumbling block we are having a rough patch as well. I guess everyone hits one once and a while


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PostPosted: Mon Aug 21, 2017 2:28 pm
 


Didn't have the glasses nor a pinhole canera, but on the walk to work i got to see the pinhole-like effect that happens through the leaves of trees. Looked cool.

The way the sunlight in general looked was eerie, like it was dusk at 11am.

Wish the lath of totality would scroll across Canada somehow, but that's probably a scientifically nonsensical statement lol


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PostPosted: Mon Aug 21, 2017 2:43 pm
 


Public_Domain wrote:
Didn't have the glasses nor a pinhole canera, but on the walk to work i got to see the pinhole-like effect that happens through the leaves of trees. Looked cool.

The way the sunlight in general looked was eerie, like it was dusk at 11am.

Wish the lath of totality would scroll across Canada somehow, but that's probably a scientifically nonsensical statement lol

It will trim it, but to go the full way across Canada, the Earth would have to wobble quite a bit more I would think. The good Dr. will probably have a better answer than I though!


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PostPosted: Mon Aug 21, 2017 3:56 pm
 


housewife wrote:
BartSimpson wrote:

Hate to say but we're hitting a rough patch after 30 years.

In any case, here's one of the best shots from the phone of what we saw here in Sacto:


Sorry to hear that Bart. After 30 years must be a bit of a stumbling block we are having a rough patch as well. I guess everyone hits one once and a while


Thank you. In about an hour I get to go home. Ugh.

Funny thought: If she decides that it's a punishment not to talk to me she'd be wrong. :P


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PostPosted: Mon Aug 21, 2017 5:10 pm
 


BartSimpson wrote:
housewife wrote:
BartSimpson wrote:

Hate to say but we're hitting a rough patch after 30 years.

In any case, here's one of the best shots from the phone of what we saw here in Sacto:


Sorry to hear that Bart. After 30 years must be a bit of a stumbling block we are having a rough patch as well. I guess everyone hits one once and a while


Thank you. In about an hour I get to go home. Ugh.

Funny thought: If she decides that it's a punishment not to talk to me she'd be wrong. :P


I hear yeah. I'm wishing for that punishment too.


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PostPosted: Mon Aug 21, 2017 6:32 pm
 


In spite of those stupid FB warnings, my dog didn't go blind.
It can still see a bag of open chips a mile away.


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PostPosted: Mon Aug 21, 2017 7:27 pm
 


I took a welding mask to the local mcdicks so the employees could have a look.


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PostPosted: Mon Aug 21, 2017 9:35 pm
 


herbie wrote:
In spite of those stupid FB warnings, my dog didn't go blind.
It can still see a bag of open chips a mile away.


What you didn't buy the dog some goggles? My son tells me they were being sold


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PostPosted: Mon Aug 21, 2017 10:00 pm
 


Why would a dog look at the sun? They're more interested in sniffing piles of shit on the ground. The sheer amount of bullshit on the Net never ceases to amaze me.
People used to phone my Internet company and ask "What's WRONG with the Internet?" hundreds of times a day. By 3 pm I'd answer "Besides being 99.9% porn, bullshit and advertising I don't know. You tell me."


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PostPosted: Tue Aug 22, 2017 6:20 am
 


Tricks wrote:
Public_Domain wrote:
Didn't have the glasses nor a pinhole canera, but on the walk to work i got to see the pinhole-like effect that happens through the leaves of trees. Looked cool.

The way the sunlight in general looked was eerie, like it was dusk at 11am.

Wish the lath of totality would scroll across Canada somehow, but that's probably a scientifically nonsensical statement lol

It will trim it, but to go the full way across Canada, the Earth would have to wobble quite a bit more I would think. The good Dr. will probably have a better answer than I though!


Quite so! Because of the height of the moon in relation to Earth's orbit, at the points in the orbit where eclipses are likely, the moons' shadow doesn't land on all the Earths surface.

Parts of the northern and southern hemisphere can't have an eclipse. I'm going to skip the relationship between a triangle and sines, because as a smart man once said "Life is hard, and math is harder".

But I found some excellent diagrams that illustrate the problem.

Eclipses are only likely at certain times of the year, as the moons shadow can miss the Earth at other times.

Image

Because of the seasonal variations of the angle of the sun to the Earth during those times, the limits of where the shadow can fall mean certain parts of Canada can't have a total eclipse.

Image

Image

Higher latitudes get what's called 'parallax error', the same sort of error you get looking at a dial of something like a speedometer from the side.

Image

So the eclipse, if it happens, looks like this:

Image

As for crossing Canada, well Eclipses don't run in a 'straight' line*, as the Earth turns underneath as the moon proceeds in it's orbit. A part of a sine wave is the best we can get, and it only lasts about two hours, and Canada covers 6 time zones. ;)

*it does run in a straight line, but the 2D result is a sine wave.


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PostPosted: Tue Aug 22, 2017 6:54 am
 


Some incredible images of the Eclipse:

The ISS as it transits the sun during the Eclipse:

Image

View of the shadow, from the ISS:

Image

https://arstechnica.com/science/2017/08 ... favorites/


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PostPosted: Tue Aug 22, 2017 7:26 am
 


herbie wrote:
Why would a dog look at the sun? They're more interested in sniffing piles of shit on the ground. The sheer amount of bullshit on the Net never ceases to amaze me.
People used to phone my Internet company and ask "What's WRONG with the Internet?" hundreds of times a day. By 3 pm I'd answer "Besides being 99.9% porn, bullshit and advertising I don't know. You tell me."


I wondered that very same thing goggles for dogs someone made money. The that surprising people payed for pet rocks too


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