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Cake day: June 10th, 2025

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  • You can shape them that no matter how the light falls on it, it will align to the center. Kind of like how satellite dishes work but in reverse.

    how do you do this, actually? I’m curious about the details because I just watched a video on compound parabolic reflectors, haha

    a regular (ideal) convex lens with a single focal point will have the image move around as the light source moves across the sky. AFAIK satellite dishes tend to be paraboloids, which focus parallel rays onto the focal point, and if you change the angle of the light source, you’ll start losing focus. Stuff like the DSN and radio telescopes absolutely do have to aim and track their targets (or are forced to follow the rotation of the earth).

    satellite dishes that are aimed towards geostationary satellites don’t have to move (because their targets are stationary in the sky), while stuff like starlink tracks targets with a phased array.






  • Ernest@lemmy.ziptomemes@lemmy.worldTake a hint
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    1 month ago

    I think there are plenty of channels that aren’t just using “cheap stock photos and/or blender animations”, and I can list some examples if you’d like. The first criterion is harder, though, because sci-com by its very nature isn’t going to be original research, so channels in this category tend to be more creative or opinion-based (i.e. multi-hour video essays).

    That said, if I’m trying to really get at the gist of what you’re saying, I think you’re looking for shows that have a lot of original work and high production value?

    Some random examples I can think of (I’m sure there’s plenty more):

    • 3 Blue 1 Brown
    • Captain Disillusion
    • Gamers Nexus (specifically their investigations)
    • Smarter Every Day
    • Every Frame a Painting (inactive but with a huge catalogue)
    • PBS Eons
    • Technology Connections
    • Montemayor
    • Taylor Lorenz
    • Climate Town
    • Tantacrul

    (this is excluding so many great video essayists and artists since the original comment seems not to be referring to those)