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comment by elizabeth
elizabeth  ·  2416 days ago  ·  link  ·    ·  parent  ·  post: Pubski: August 16, 2017

I KNOW! I'M SO CLOSE!

But they want shots including their quarry so i'm stuck at the 99% zone... Still pretty dope they're flying me in for that. I've never seen even a partial eclipse before. Not ever a lunar one. We ordered some glasses for everyone too.

I'm actually planning to punch holes in a poster in the shape of the company's logo and project half-moons into the marble inside the quarry. I tried explaining how awesome that is but I'm not so good at explaining. Hopefully they'll understand what I meant when I make the video. They were asking me WHY the shadows will be half-moons and I was like... cause pinhole photography? Physics?

Thanks for the link - I knew you'll have the insider information forums!

I'll be in a city called Tate in Georgia - north of Atlanta. Out of the path of totality by a few miles :(





user-inactivated  ·  2416 days ago  ·  link  ·  

    They were asking me WHY the shadows will be half-moons and I was like... cause pinhole photography? Physics?

Ah, a question I can answer! The sun is not a point source of light. It acts like a uniform disk of light in the sky. This is why on a normal sunny day your shadows are, for lack of a better word, soft. A diffuser sort of, but not exactly, does this as well; it takes the light from a point source, aka light bulb, and spreads it out a bit. The little pin holes mirror the sun's disk on the object that the light is projected on. As long as the sun is a disk, that image will be round. As the moon move in front of the sun, you see less and less of a disk and more of a crescent. Now, the light from the sun is still not a point source of light, but it is also not a perfect disk either. The shadows on the ground reflect the change in the shape of the sun as the eclipse progresses. One of the things that I intend on documenting is when shadows stop being soft and start having hard edges. (My guess is at 75% covered but we will see.)

If you have a square light source, by the way, and use a pinhole projector? The image looks more square than round.

Here is a picture that shows rather than explains. Everyone in that outer, perumbra, shadow will see a partial eclipse. Only in the that cone of shadow, the umbra, is the eclipse total.

    I'll be in a city called Tate in Georgia - north of Atlanta. Out of the path of totality by a few miles :(

Yea you are maybe 10 miles from the fun stuff. We get to do this again in six and a half years so use this as the excuse to whet the appetite for a total eclipse. Still a bummer, but when work is paying the bills you gotta do what they want you to do, right?

And just because I had it up already for some other sites I looked at the NWS report for Tate. Thunderstorms and 30% chance of rain on the day of. Prepare an out for your gear in case of rain. Hopefully you get to dodge the rain and get some great pictures.

elizabeth  ·  2415 days ago  ·  link  ·  

Yeah it rains on and off every day over there - but hopefully the skies will clear up at the moment of the eclipse. Would be a bit of a bummer if not.

Thanks for the explanation - I understand a lot better now :)

Have fun on your own eclipse adventure!