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APOD: An Eclipse Tree (2023 Oct 15)
Posted: Sun Oct 15, 2023 4:06 am
by APOD Robot
An Eclipse Tree
Explanation: Yes, but can your tree do this? If you look closely at the ground in the featured image, you will see many images of
yesterday's solar eclipse -- created by a tree. Gaps between tree leaves act like
pinhole lenses and each create a
small image of the partially
eclipsed Sun visible in the other direction. The image was taken in
Burleson,
Texas,
USA. Yesterday, people across the
Americas were
treated to a
partial eclipse of the Sun, when the Moon moves in front of part of the Sun. People in a
narrow band of Earth were treated to an
annular eclipse, also called a
ring-of-fire eclipse, when the Moon becomes completely
engulfed by the Sun and sunlight streams around all of the
Moon's edges. In answer to the
lede question, your tree not only can
do this, but
will do it every time that a visible solar eclipse passes overhead. Next April 8, a deeper,
total solar eclipse will move across
North America.
Re: APOD: An Eclipse Tree (2023 Oct 15)
Posted: Sun Oct 15, 2023 4:31 am
by VictorBorun
…I used to be taken driving and notice the speckled shadows moving across the carriage, before it occurred to me that they were caused by the leaves overhead. (As soon as I discovered this, the scientific interest killed the impression, and I began speculating as to why the patches of light were always circular and so on.)
Bertrand Russell, Autobiography
Re: APOD: An Eclipse Tree (2023 Oct 15)
Posted: Sun Oct 15, 2023 4:05 pm
by Peter Bradford
The first time I saw these crescents on my dad's lawn was, I think, in 1954 when I was just sixteen. Not having any appropriate equipment I viewed the eclipse indirectly by looking at its reflection in a very still pond.
https://en.wikipediaDOTorg/wiki/Solar_e ... e_30,_1954
Re: APOD: An Eclipse Tree (2023 Oct 15)
Posted: Sun Oct 15, 2023 5:23 pm
by johnnydeep
Peter Bradford wrote: ↑Sun Oct 15, 2023 4:05 pm
The first time I saw these crescents on my dad's lawn was, I think, in 1954 when I was just sixteen. Not having any appropriate equipment I viewed the eclipse indirectly by looking at its reflection in a very still pond.
https://en.wikipediaDOTorg/wiki/Solar_e ... e_30,_1954
What's with your use of "DOT" instead of a period? Working URLs
are allowed to be posted here.
Re: APOD: An Eclipse Tree (2023 Oct 15)
Posted: Sun Oct 15, 2023 7:02 pm
by orin stepanek
![S_231015.jpg](./download/file.php?id=48603&sid=5cef2cae2170995d211773178622da34)
- S_231015.jpg (3.21 KiB) Viewed 12206 times
Reminds me of a post with shadows on a shirt!
Re: APOD: An Eclipse Tree (2023 Oct 15)
Posted: Sun Oct 15, 2023 7:07 pm
by Chris Peterson
Re: APOD: An Eclipse Tree (2023 Oct 15)
Posted: Sun Oct 15, 2023 7:19 pm
by johnnydeep
Chris Peterson wrote: ↑Sun Oct 15, 2023 7:07 pm
Funky eclipse fingers!
_
PXL_20231014_162304168p.jpg
So what's going on there? Is your hand posed in the typical "Ok" sign formation? That has only one pretty large - not pinhole - opening, right? And just how many eclipse images are we seeing? At least six?
Re: APOD: An Eclipse Tree (2023 Oct 15)
Posted: Sun Oct 15, 2023 7:28 pm
by Chris Peterson
johnnydeep wrote: ↑Sun Oct 15, 2023 7:19 pm
Chris Peterson wrote: ↑Sun Oct 15, 2023 7:07 pm
Funky eclipse fingers!
_
PXL_20231014_162304168p.jpg
So what's going on there? Is your hand posed in the typical "Ok" sign formation? That has only one pretty large - not pinhole - opening, right? And just how many eclipse images are we seeing? At least six?
My index finger was curled into the base of my thumb, tightly enough to make a roundish aperture about a centimeter in diameter. Other fingers were loosely extended. You have the primary crescent from my deliberate aperture, and a lot of weird shadows created by the slit-like light source, which results in asymmetric penumbras.
Re: APOD: An Eclipse Tree (2023 Oct 15)
Posted: Sun Oct 15, 2023 7:42 pm
by johnnydeep
Chris Peterson wrote: ↑Sun Oct 15, 2023 7:28 pm
johnnydeep wrote: ↑Sun Oct 15, 2023 7:19 pm
Chris Peterson wrote: ↑Sun Oct 15, 2023 7:07 pm
Funky eclipse fingers!
_
PXL_20231014_162304168p.jpg
So what's going on there? Is your hand posed in the typical "Ok" sign formation? That has only one pretty large - not pinhole - opening, right? And just how many eclipse images are we seeing? At least six?
My index finger was curled into the base of my thumb, tightly enough to make a roundish aperture about a centimeter in diameter. Other fingers were loosely extended. You have the primary crescent from my deliberate aperture, and a lot of weird shadows created by the slit-like light source, which results in asymmetric penumbras.
Thanks. Then something like this I presume:
Re: APOD: An Eclipse Tree (2023 Oct 15)
Posted: Sun Oct 15, 2023 7:45 pm
by Chris Peterson
johnnydeep wrote: ↑Sun Oct 15, 2023 7:42 pm
Chris Peterson wrote: ↑Sun Oct 15, 2023 7:28 pm
johnnydeep wrote: ↑Sun Oct 15, 2023 7:19 pm
So what's going on there? Is your hand posed in the typical "Ok" sign formation? That has only one pretty large - not pinhole - opening, right? And just how many eclipse images are we seeing? At least six?
My index finger was curled into the base of my thumb, tightly enough to make a roundish aperture about a centimeter in diameter. Other fingers were loosely extended. You have the primary crescent from my deliberate aperture, and a lot of weird shadows created by the slit-like light source, which results in asymmetric penumbras.
Thanks. Then something like this I presume:
hand in ok sign form.jpg
Almost exactly like that.