• 2 Posts
  • 341 Comments
Joined 3 years ago
cake
Cake day: October 6th, 2023

help-circle






  • Cocodapuf@lemmy.worldtoxkcd@lemmy.worldxkcd #3238: Soniferous Aether
    link
    fedilink
    English
    arrow-up
    32
    arrow-down
    1
    ·
    edit-2
    3 days ago

    That is not the speed of light through fiber. That is the speed of light bouncing at diagonal angles as it travels through fiber.

    It appears to travel slower because it’s not traveling in a straight line. But I promise, every individual photon is traveling at exactly c. Photons emmited simultaneously will not all arrive at a destination at the same time, but this isn’t because they’re traveling at different speeds, it’s because they’re taking different paths, reflecting and refracting slightly differently.



  • Our moon is definitely the most important body in the solar system after the sun and earth. There’s a good chance life is only possible on earth because of the moon.

    The thing is, here on earth, we have this wealth of life and diversity, but we only have this diversity because we have a diversity of elements to work with. On most planets, we don’t see this diversity of elements, the same proportion of heavy elements have to be there somewhere, but we don’t see them on the surface. We’re pretty sure that this is because on other planets we don’t see plate tectonics. The process of plate tectonics churns and mixes the earth, it brings heavier elements that would normally be trapped underground back up to the surface.

    The crazy part, is that we’re not 100% sure why we have plate tectonics, and why all the other planets in our solar system don’t. But a leading theory is that plate tectonics are sustained by the tidal forces of a very large moon.

    If this interpretation is accurate, we really owe so much to the moon. Its continued gravitational force on the earth is what has made everything (life, intelligence, society, technology) possible.

    Also, in a Drake equation/Fermi Paradox context, the perfect moon may very well be the extremely rare event that makes the earth truly special.




  • You should consider taking it apart and seeing how the buttons work, things like how large the spring is, what the actual electrical contact mechanism looks like, if there are guide tracks on the side of the button that allow it to press down evenly instead of tilting to one side or jamming.

    If you know how it works, then even if you don’t find the exact same part from the exact same manufacturer, you’ll still be able to find something that works the same way and feels just the same, you may even find it cheaper or locally.

    I’m a strong proponent of taking things apart.





  • How does this line up with lunar cycles? Is the solar year closer to 12 or 13 months?

    Edit: I decided to answer my own question. It turns out there are about 12.4 lunar cycles per solar year, so it does fall right between 12 and 13, meaning that (in my opinion) both 12 and 13 months seem like reasonable systems.

    Unfortunately it also means there’s no way to really sync the months with the year perfectly.

    A side note on the solar year/lunar month not lining up… I know that planets in a star system tend to fall into resonant orbits, so you’ll often see common ratios in planetary orbital periods, making occultations more common (when planets all line up). But I actually don’t know how this relates to a planet’s moons.