this post was submitted on 20 May 2025
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[–] folekaule@lemmy.world 94 points 2 days ago (1 children)

At least our hours are the same length regardless of latitude now, so let's be grateful for that.

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[–] WanderingThoughts@europe.pub 83 points 2 days ago (1 children)

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IIRC they counted the bones in their fingers using their thumb and that gives 12. The first sundial was around the equator and there is always light for half a day, so half a day becomes 12 hours.

To count large numbers often one hand was used to count using 5 fingers and the other to count the bones, so you get 5x12 for 60 minutes.

[–] WolfLink@sh.itjust.works 49 points 2 days ago* (last edited 2 days ago)

AIUI there was an aspect in the divisibility of the numbers being convenient.

12 is divisible by 2, 3, 4, and 6. 60 is divisible by 2, 3, 4, 5, 6, 10, 12, 15, 20, and 30.

10 is divisible by 2 and 5. 100 is divisible by 2, 4, 5, 10, 20, 25, and 50.

If you want to minimize dealing with fractions, 12 and 60 are far more convenient than 10 and 100.

[–] echodot@feddit.uk 57 points 1 day ago (5 children)

If the day started at 1:00 then by the second hour you would be at 2:00, even though only 1 hour has passed. Effectively the day starts at 0. In fact in 24-hour time that is how it's depicted, 00:00 with midday being depicted as 12:00, so it isn't confusing

[–] Ricaz@lemmy.dbzer0.com 6 points 21 hours ago (1 children)

Careful, there are Americans around

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[–] lobut@lemmy.ca 54 points 2 days ago (3 children)

I only recently learned the etymology of the word: "second"

Its name comes from being the "second" division of the hour, with the minute being the first.

[–] x00z@lemmy.world 23 points 2 days ago* (last edited 2 days ago) (1 children)

I'll see you in 5 firsts, 2 seconds and 7 thirds.

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[–] ExtantHuman@lemm.ee 8 points 2 days ago* (last edited 2 days ago)

I honestly hate this.

It's like bad world building for some throwaway fiction story.

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[–] Honytawk@lemmy.zip 32 points 2 days ago* (last edited 2 days ago) (9 children)

Days start at 0h, not 12h

It can't start at 12 hours if there are 24 segments.

And keep your letters out of it too.

[–] tauren@lemm.ee 22 points 2 days ago (4 children)

Days start at 0h, not 12h

Show me where is the zero here?

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[–] mumblerfish@lemmy.world 12 points 2 days ago (7 children)

The AM/PM bullshit:

AM: 12, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11

Then the same for PM. Who counts like that? Whats after 12? 1! What?

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[–] Lucien@mander.xyz 25 points 2 days ago (4 children)

We have Babylon to thank for this

[–] UnderpantsWeevil@lemmy.world 9 points 2 days ago* (last edited 2 days ago) (1 children)

Our mistake was not embracing base-12 time, it was failing to embrace a base-12 counting system.

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[–] MilitantAtheist@lemmy.world 25 points 2 days ago (20 children)

Clocks should use 24h format. AM/PM is completely useless.

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[–] ssfckdt@lemmy.blahaj.zone 24 points 2 days ago (3 children)

Somebody never had a clock with roman numerals and it shows

I remember getting into an argument with a grade school teacher over IIII because most such clocks put that for 4 instead of IV because of some fuckin reason

[–] Opisek@lemmy.world 16 points 2 days ago* (last edited 2 days ago) (2 children)

I despise these so so much. IIII was historically NEVER correct. Some doofus decided to put that on a clock because it looks more symmetrical with the VIII on the other side. Terrible reasoning.

[–] mhague@lemmy.world 5 points 1 day ago

IIII was the way Romans usually wrote 4. It's associated with simplicity / illiteracy. But also depended on era, region, intended audience, or practicality. I think the most famous example is the coliseum using LIIII.

There's still variation even now; standardization is relatively new, and it's not common knowledge. And dates... it's like every 50-100 years people decided to write them differently.

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[–] naticus@lemmy.world 8 points 2 days ago (4 children)

Weird, I've seen many analog clocks with Roman numerals but always IV for 4.

[–] topherclay@lemmy.world 18 points 2 days ago (1 children)

It's actually called the "clockmakers four" or "watchmakers four." it's a thing.

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[–] rumba@lemmy.zip 5 points 2 days ago

To be fair, Google searching Roman numerals clocks give you about a 50/50 distribution.

I wasn't aware of this either and I suspect we're not alone. It's not highly noticeable and if there's a 50-50 chance won't even see it...

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[–] ch00f@lemmy.world 22 points 2 days ago (3 children)

Sundials.

Now if you want to get really pissed, the magnetic North Pole is actually the South Pole of the Earth’s magnetic field. We call it the North Pole because the north side of a magnet points to it.

[–] Soggy@lemmy.world 5 points 2 days ago

Don't tell them about positive/negative electron movement.

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[–] JordanZ@lemmy.world 21 points 2 days ago (3 children)

Somebody gave me this clock…I just need the time.

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[–] teslasaur@lemmy.world 18 points 1 day ago* (last edited 1 day ago) (2 children)

It's the same logic that was used by ancient astronomers to arrive at 360 degrees for a full revolution.

The math is easier if you have to do it by hand.

[–] nialv7@lemmy.world 11 points 1 day ago (2 children)
[–] Hobo@lemmy.world 7 points 1 day ago (5 children)

It's also the one advantage Imperial has over metric. It's easier to do mental math in a lot of cases in base 12 rather than base 10.

Now excuse me while I bar my windows and doors from the mobs of angry people that show every time I point this out.

[–] ultracritical@lemmy.world 6 points 1 day ago

Only really counts for feet and inches. But yes, having your base unit be divisible by halves, thirds, quarters, sixths, and twelths with whole numbers of sub units is highly useful when fabricating objects when you don't have access to modern tooling and supplies. In fact I would argue base 12 is the superior numerical system that was abandoned for metric and we have lost something in the meantime. Though Jan Misali might disagree with his love for sexinal.

Imperial units do have another advantage to this day, though. When talking about machining bolts and threads Imperial use threads per inch or threads per unit length while metric uses the pitch of the thread, so mm in-between threads. This decision means that when machining imperial nuts and bolts we by default pick whole numbers of threads per inch which due to the circular nature of lathes means that a simple clock dial can keep the lead screw synchronised with the head. Since metric uses pitch we pick numbers like 1.25mm pitch which does not always synchronous well with the lead screw and head and requires some odd gear ratios to cut specific threads.

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[–] LanguageIsCool@lemmy.world 17 points 2 days ago

The 6 means 30, both of which also mean 1/2

[–] StThicket@reddthat.com 13 points 2 days ago (4 children)

When I become dictator of the world, this will be the new time unit: https://metric-time.com/

The year will also have 13 months: https://en.m.wikipedia.org/wiki/International_Fixed_Calendar

The year will be 12025: https://en.m.wikipedia.org/wiki/Holocene_calendar

Because these things just make more sense. You will thank me after a few generations, because habits are hard to change.

[–] the_tab_key@lemmy.world 5 points 2 days ago

Redefining the definition of a second sounds very problematic.

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[–] ryedaft@sh.itjust.works 13 points 2 days ago

If you want to be mad about time then I'd like to introduce you to a little thing I like to call the Gregorian calendar.

[–] mutual_ayed@sh.itjust.works 9 points 2 days ago (1 children)

sub.wetshaving.social?

What is this?

[–] partial_accumen@lemmy.world 17 points 2 days ago (2 children)

My guess is there are only so many conversations you can have over whether a Silvertip Badger is superior to a Boar brush.

[–] mutual_ayed@sh.itjust.works 6 points 2 days ago

But there's a million razorblades people can argue about. Platinum, tool steel, carbon. And then there's which holder is the best. And then all the straight razor refinishing/refirbishing you could get into. Not to mention, strops, towels, soaps, sebum oils, styptics and on and on.

[–] weird@sub.wetshaving.social 5 points 2 days ago

You'd be surprised

[–] PieMePlenty@lemmy.world 9 points 1 day ago* (last edited 1 day ago) (1 children)

Hour hand -> hour = n
Minute hand -> minute = n * 5
It makes sense, there's just an algorithm attached to each pointer.

Hour -> 3 = 3
Minute -> 3 = 3 * 5 = 15

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[–] lmmarsano@lemmynsfw.com 9 points 2 days ago (2 children)

Gift from ancient Mesopotamia. Mesopotamians love 12 & base 60. They also liked 7. Those numbers recur in their mythology.

Americans have a weird fixation with 💯. Where Americans might use percentages, I've seen Japanese plot values in [0, 1] (ie, pure proportions).

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[–] ParadoxSeahorse@lemmy.world 8 points 1 day ago

Well it’s because noon means nine because the day starts at six o’ clock, so three is noon, but we use it to mean twelve which is closer to midday, obviously

[–] jol@discuss.tchncs.de 6 points 2 days ago* (last edited 2 days ago) (2 children)

In Ethiopia they still use the tradition time where the day starts at the 1:00 which is our 6am. Then 12:00 is our 6PM, and it starts over. So they have 2 cycles of 12 hours, one for daytime, and one for night time. And it felt somewhat more intuitively in conversation too.

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[–] saltnotsugar@lemm.ee 6 points 2 days ago (2 children)

I say we divide the day into 100 sections. No reason really I just think it’d be cool to party until 100 o’clock.

[–] dxdydz@slrpnk.net 7 points 2 days ago

You might like reading about decimal time…

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