2023-04-03 11:51:04 <KipIngram   > Wow, it was 1984 before we could actually see the same issue that originally showed up in the late 1800's with the orbit of Mercury.  For all the other planets is a more insignficant effect and we couldn't see it until much later.
2023-04-03 11:51:39 <KipIngram   > Also, general relativity wasn't needed until 1984 for ephemeris computation.  Up until then our accuracy was handled by Newton's theory.
2023-04-03 11:51:44 <KipIngram   > (except for Mercury).
2023-04-03 11:52:17 <KipIngram   > On the other hand, time computations incorporated general relativity in the 1970's.
2023-04-03 11:52:51 <KipIngram   > We couldn't detect the slowing of Earth's rotation experimentally until the 1920's.
2023-04-03 11:53:23 <KipIngram   > Clock technology became accurate enough to "see" it around then.
2023-04-03 11:53:40 <KipIngram   > Guess the venerable old pendulum clock just wasn't up to that job.
2023-04-03 11:53:58 <thrig       > mostly people make do with quartz crystals, if you're into that vibe
2023-04-03 11:55:00 <KipIngram   > Heh.  Well, that's what replaced the pendulum clock.  First improvement, beyond "careful calibration and compensation" in like 300 years.
2023-04-03 11:55:33 <thrig       > or you end up with a 5 minute cron job to wack the date into place because the mobo clock chip is that bad
2023-04-03 11:55:39 <KipIngram   > Apparently there was something called the Shortt-Synchronome clock that showed up in the 1920s, but it wasn't technology that "went public," so to speak.
2023-04-03 11:56:44 <KipIngram   > That one is a pendulum clock, actually, so maybe I should caveat what I just said.  It could see the Earth slow down, but it was a highly specialized instrument.  You didn't find it in people's parlors.
2023-04-03 11:57:52 <KipIngram   > Looks like only about 100 of them were ever made.
2023-04-03 11:58:11 <KipIngram   > But they were "the clock" for a couple of decades in the early to mid 1900's.  Used for all the high brow stuff.
2023-04-03 11:58:28 <KipIngram   > Wikipedia cites it as the first clock that was a more accurate timekeeper than Earth itself.
2023-04-03 11:58:46 <KipIngram   > That's kind of a cool thing to be remembered for.  :-)
2023-04-03 12:00:43 <KipIngram   > Oh, that's interesting.  It used two pendulums, such that one experienced practically zero external interference.
2023-04-03 12:00:58 <KipIngram   > The primary pendulum is kept in a vacuum.
2023-04-03 12:01:26 <thrig       > probably they were also trying to figure out the 9.8m/s^2 thing
2023-04-03 12:01:34 <KipIngram   > They were kept in separate locations (the two pendulums) to guarantee no mechanical phase locking between them.
2023-04-03 12:01:44 <KipIngram   > https://en.wikipedia.org/wiki/Shortt%E2%80%93Synchronome_clock
2023-04-03 12:01:58 <KipIngram   > I've discovered that pendulum clock science is just super interesting.
2023-04-03 12:06:08 <KipIngram   > The cost was equivalent to about $15k today.
2023-04-03 13:26:53 <KipIngram   > This is a nice treatment:
2023-04-03 13:26:55 <KipIngram   > https://www.youtube.com/playlist?list=PL9VUuob0B7Mjxh0uWsrJwyz8k3F10YfIN
2023-04-03 13:27:08 <KipIngram   > Geometric algebra - I've decided it's really how we should be taught from the start.
2023-04-03 13:27:27 <KipIngram   > It just brings such a "unity" to a whole bunch of things normally taught separately.
2023-04-03 13:28:53 <KipIngram   > Apparently geometric algebra and Clifford algebra are just two ways of referring to the same material.  Treatments of "Clifford algebra" are usually a little more algebraic and less built around geometry ideas.
2023-04-03 15:40:05 <veltas      > My mechanical watch is one of my favourite posessions, I love a little spring can keep time to within a few seconds every day while on my hand knocking about everywhere
2023-04-03 15:40:13 <veltas      > And powered by my movements
2023-04-03 15:40:47 <veltas      > It strikes me as a forthy machine, it's good at what it does and nothing else
2023-04-03 15:41:00 <veltas      > But really all of mechanical engineering is like that
2023-04-03 15:41:19 <veltas      > A lot of software 'disciplines' try to make software more like engineering
2023-04-03 15:42:10 <veltas      > I set it every morning, I've been trying to adjust its timing, currently it loses about 5 seconds every day +/-1s. I'll get it on the sweet spot eventually
2023-04-03 16:41:48 <KipIngram   > Oh yeah - they really are nigh miraculous devices.  Human ingenuity at its best.
2023-04-03 16:42:16 <KipIngram   > What do you adjust to calibrate its speed?
2023-04-03 21:31:36 <vms14       > haha I made a bot
2023-04-03 21:31:41 <vms14       > oh: 1 2 3
2023-04-03 21:31:45 <ohbot       > [1 2 3]
2023-04-03 21:32:35 <vms14       > https://termbin.com/c558 here's the code
2023-04-03 21:32:40 <vms14       > but seems to not want to die
2023-04-03 21:32:42 <vms14       > oh die