Also see this: https://gist.github.com/timvisee/fcda9bbdff88d45cc9061606b4b923ca
It amazingly explains all the insanities for handling dates and times.
this post was submitted on 20 May 2025
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6 means 30 is some toilet paper math
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
As a programmer I'd rather it start at 0
Which is also why I hate that our calendar starts at year 1.
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.
You've gone 360 on me.
These are called "superior highly composite numbers" apparently https://en.wikipedia.org/wiki/Superior_highly_composite_number
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.
Let me jump in until the mobs show up. "Noooooo, it's just what you're used to lalala. When is dividing by thirds ever useful, anyway?".
I've also found that if you make this point without any reference to metric vs imperial, people tend to accept it.
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.
Poor 70. Imagine being the objectively "weird" one out of a hundred.
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
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
The first clocks didn't have a minute hand though.
Relatively funny but gets worse the more you think about it.
The 6 stands for 6, not 30.
When we have AM and PM it would be dumb to have 1-24.
1 is the end of the 1st hour. 2 the end of the second. This is why it starts at 0.
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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
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.
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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The 6 means 30, both of which also mean 1/2
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