Marcos Dione

https://en.osm.town/@mdione

Developer, SysAdmin, Open Source, map and photo enthusiast; POI collector.

GitHub: https://github.com/StyXman/
Website: https://www.grulic.org.ar/~mdione/glob/

Public Key

npub1q9pz878c5hksxhnu28lfcu76stqxw5rgjclq0yx9zss9mfz055tq8d4za9

NIP-05 Address

mdione_at_en.osm.town@momostr.pink

Profile Code

nprofile1qqsqzs3rlru2tmgrte79rl5uw0dg9sr82p5fv0s8jrz3ggza538629s4g6ad8

Author Public Key

npub1q9pz878c5hksxhnu28lfcu76stqxw5rgjclq0yx9zss9mfz055tq8d4za9

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Last Notes

2024-10-05 16:22:36

Made 6h+ on a car to come to Cervinia and try my luck at #aurora #photography. Will have to climb some 500m is the blue light to get to a good position. I wanted to rent an ebike or a hotel room, but it's all closed. Apparently nothing happens in autumm.
Meanwhile, coffee and picking food and hopin for clear skies and not to freeze to death. Good hunting!
https://cdn.masto.host/enosmtown/media_attachments/files/113/255/737/879/751/855/original/2369a9e54cd89fba.jpg

2024-09-30 08:55:17

#Utilitarianism #TrolleyProblem #philosophy #comics
https://www.smbc-comics.com/comic/util
https://cdn.masto.host/enosmtown/media_attachments/files/113/225/663/419/171/721/original/84c3f40fd6d251e9.png

2024-09-21 23:08:02

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yes, in fact, I am asking that level of detail. I could try to read Feyman's explanation that was li ked above, but it might probably require more math than I can follow now. That's somethimg I like about Angela Collier's videos. She explains things in a way that at least gives me the illusion that understand :)

2024-09-21 09:47:46

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olráit, I tried... :)

2024-09-20 20:33:39

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what happens to the parts of the secondary waves that are not in the tangent? Are they lost? Do they interfere and cancel each other? Are they experienced from another point of view? If the light I see in the tangential wavefront is almost the same intensity of the original light, does it mean that the points in the secondary waves all have the same intensity? It seems I'm getting into territory way beyond what I 'know'.

2024-09-20 20:28:29

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seems like Huygens' explanation is also geometric. It goes from the wave aspect of light to a frozen wavefront where every point in it also emits a wavefront, and the combination of those are the wavefront we experience. That recursive explanation sounds fishy; again, I should read/watch about that Huygens' whatever (he never seem to say exactly what, just "according to Huygens"... what, a theory?).

2024-09-20 20:24:19

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let's go back to "how the reflection from each point on the mirror combines to give the angle of reflection". In the image and video says that each point where the original rays touch the mirror surface emits light in 'arcs' (bubbles, really), and it's the combined tangential wavefront that becomes the image we see. Bu it's taking a geometrical approach that in my head is equivalent of just saying "the angles are the same".

2024-09-20 17:33:47

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uff, I think I need a source-mirror-eye-retina schematic to understand how we don't see scattered light? My head is sinning around incomplete schematics...

2024-09-20 16:15:12

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ok, assume I understand the Huygens whatever (will have to find a video about that). How does it apply to a dot light source? There's a whole circular reflection, but only a single reflection, if you know what I mean. Is it a matter of just taking the limit to a 0 with image?
It's been a long time since I could do it myself, mostly because of lack of time and of exercise. Maybe I should create a patreon account, send some money to Angela, and ask for a video :)

2024-09-18 20:10:09

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glass is not metal but it's partially reflective. It's not the same?

2024-09-18 14:58:11

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hmmm, I probably need to rewatch a couple of Angela Collier videos to understand that. That's why I asked for a video, a short description like that one, while appreciated, assumes I know more than I do by heart :)

2024-09-18 14:46:49

Dear #physics #optics nerds: can someone point me to a video that explains exactly how mirrors work? I particular, how does a "reflected" ("reemitted", although it's actually a electron going back to a lower energy state?) photon know the _angle_ at which it should go?
Writing all this makes me wonder: AFAIK the frequency at which a photon is emitted when an electron goes back to a lower energy state depends on the "size" of that jump. Does that mean that mirrors can't reproduce all colors?

2024-09-10 06:35:05

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I had a Chinese coworker who stuttered. At work we spoke English and French, and half of the time they were hard to understand because of the accent and stuttering combined. One day I heard them talking in Chinese on the bus. They didn't stutter. I asked them later about it and they told me that the stuttering was because they thought they were really bad in English and French and got nervous.

2024-09-06 16:52:15

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for full pages it was released two releases ago. For text selection, it's now in the RMB/context menu.

2024-09-02 17:15:02

@npub1xu2…rllr "Adulting is a soup and I am a fork": at least you get the good bits? :)
Jokes apart, I feel you.

2024-08-26 21:19:56

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yes, probably those ones, with yellow/orange beak. I also saw them at Aguille du Midi, Chamonix:
https://cdn.masto.host/enosmtown/media_attachments/files/113/030/410/685/869/410/original/34d50ed9ca012a64.jpg

2024-08-17 08:06:32

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"Last night"?

2024-08-10 10:13:36

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did you check #OpenStreetMap ?

2024-07-04 19:48:40

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I don't understand the two circles. And doesn't biomass produce CO2 too?