observantTrapezium

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Joined 1 year ago
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Cake day: June 30th, 2023

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  • Not sure this statement is true if “more closely related” is understood as shorter combined time between the two species from their most recent common ancestor. Hummingbirds and brachiosaurs had a more recent common ancestor than brachiosaurs and triceratopses (albeit probably still quite close to the dawn of dinosaurs in the Late Triassic ), but the latter pair lived closer in time to the common ancestor of all dinosaurs (while hummingbirds are from the Oligocene).





  • observantTrapezium@lemmy.catoScience Memes@mander.xyzSeconds
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    2 months ago

    That may be relativists (they would actually measure anything in units of mass, with everything else defined through G = c = 1). Astrophysicists commonly measure mass in solar masses, long distances in parsec (or kiloparsec, megaparsec), short distances in solar radii or AU, and time in whatever is relevant to their problem (could be seconds or gigayears)


  • I’m sitting on an Aeron at work, it’s good, but I can’t in good conscience pay that much for a chair. I was recently on the market for a new office chair and extensively researched it. It really looks like it’s a hit or miss with every chair in every price range, and I was very seriously considering replacing my Hyken with another Hyken. I decided to go with the IKEA Markus and have been sitting on it for about a month. I’m only moderately happy with it, may even return it before the year is up although I’d hate doing it.



  • Astrophysicist here. Yes, space is crazy, but interesting things to keep in mind:

    1. The size of a star is determined by something called the photosphere. With those extremely massive stars, you can be hundreds of millions of kilometres “inside” and not yet know it.
    2. Similar story with supermassive black holes, from the perspective of an astronaut falling in, they wouldn’t really be able to tell when they cross the horizon because the tidal forces there are very small (they will inevitably fall towards the centre and get spaghettified at some point)


  • I think younger people in Canada only know °F if their thermostat is set to it and they can’t or don’t bother to change. My stupid fridge is in Fahrenheit and that can’t be changed (even though the handbook shows the display in Celsius! A variation of the model is probably sold abroad).

    I think Canada properly adopted Celsius, kilometres, litres and millilitres (at least here in Toronto), but all other metric units are the underdog. Even CBC, that is probably the only media outlet that tries to stick to metric will specify people’s height in feet and inches. Shameful.


  • Interestingly, that is not the case. Month names can differ in different languages. I discovered the hard way that Ukrainian has completely different names for months when I had to connect to a Linux machine in Kyiv with Ukrainian locale (I can read Cyrillic, but the abbreviated month names meant nothing to me). The name for August is “serpen” by the way, and it is similar in some other Slavic languages. Also Arabic has its own month names based on Akkadian, August is “ab” but an Arabized version of the word August is also commonly used and understood. Finally, in Mandarin and presumably other Chinese languages, Gregorian months are only referred to by their number, so we are in “bayue” (lit. eight(th) month).


  • The start of the calendar has to be arbitrary, there’s no way around that as it’s not feasible to measure the time since the beginning of the universe with good enough accuracy.

    As others commented, the Julian Day is a time measure that is actually used in astronomy, and Unix time is a time stamp standard (not really a calendar, although it could be if we got used to it) that is mostly a way to store time points, not really to consume them before converting to a more readable form.

    But as a scientist who is wholly irreligious, I’m not overly bothered by using the Gregorian calendar, even though it has Christian (and a lot of pre-Christian) elements. Its annoyances (different numbers of days in each month, weeks not aligning with years, leap years etc.) are due to the fact that we decided to measure time in these arbitrary units. At least it’s universal in the modern era (often in conjunction with another calendar), and everywhere you go people understand what “August 5, 2024” means (although August might have to be translated to the target language, since the names of the months are not universal).

    That’s more than you can say about non-time units of measurement (I’m looking at you, imperial and US customary units!!)




  • You can’t successfully use a home email server.

    Mostly true (server can be home but using the ISP network directly probably won’t work)

    You can’t successfully use an email server on a (cloud) VPS.

    Bullshit

    You can’t successfully use an email server on a bare metal machine in your own datacenter.

    Bullshit

    As such, it is my distinct displeasure to declare the death of SMTP. The protocol is no longer usable. And as we can see, this devolution occurred organically.

    Bullshit