• 0 Posts
  • 34 Comments
Joined 2 years ago
cake
Cake day: June 15th, 2023

help-circle

  • hinterlufer@lemmy.worldtoScience Memes@mander.xyzkawaiiiiiii
    link
    fedilink
    English
    arrow-up
    16
    ·
    8 months ago

    So, a typical pupil is around 2 mm in diameter in bright conditions. With the Rayleigh limit that results in an angular resolution of 1.22 * 60010^-9 m / 210^-3 m = 3.66*10^-4 rad

    At a distance of 5 x 3 mi = 15 mi = 24.1 km this corresponds to a point to point distance of

    tan(a/2) = (d/2)/l

    d = tan(a/2) * l * 2 = tan(3.66*10^-4) * 24100 * 2 = 8.8 m

    So in conclusion, with regular, human-like eyes he could discern points that are at least 8.8 m apart in the best case scenario. Discerning hair color from the color of the clothes would need a much higher resolution, and the horsemen are probably not 10 m apart from each other either. And again, this is a theoretical limit, real-world resolution would probably be significantly lower.







  • If you’re looking for a cheap good one, get those super cheap ones from AliExpress/etc. Imho these are soo much better than anything else you can get in the consumer space, and even some commercial ones because they are super responsive. The only downsides are that they’re relatively small so reading the display with a large bowl on top is a bit difficult and they’re probably not super accurate, especially with low loading. But that’s not really an issue for cooking. They take regular AAA batteries that last for ages and the thing costs like under 5€. I’ve had mine for like 8 yrs now and aside from a bit of liquid that got into the display it still works completely fine.

    Here’s the type I’m talking about:

    spoiler













  • There was this company doing something similar with CDs. They sold the physical medium and then let you download the ripped files and store the CDs at their place. In fact, you could just buy the record online and directly download a .flac from their website. And if you wanted, you could have the physical medium shipped to you.

    Apparently that was legal, but they have gone bankrupt a few years ago iirc. They were called Murphies (idk about the spelling).