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Infinite loop in macOS Night Shift in the summer near the Arctic Circle

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Re: Infinite loop in macOS Night Shift in the summer near the Arctic Circle

#91

Post by wil421 »

mason55 wrote: post #39
inlined wrote: post #26

Earlier quoted context omitted.

My favorite incorrect fact is that there are 24 timezones. In fact, the number of offsets from UTC fluctuates throughout the year (at least last I worked on scheduling in 2012. Back then it was either 39 or 40 depending on DST)

Yeah I always feel like a jerk when people open tickets in the summer saying “Please do this at #:## EST” and I have to reply “thanks for providing a time but it’s currently EDT in NYC. Is that what you meant?”

No reason to be snarky with people. They mean whatever time it currently is or will be.

Re: Infinite loop in macOS Night Shift in the summer near the Arctic Circle

#93

Post by danaliv »

macintux wrote: post #81
danaliv wrote: post #76

Earlier quoted context omitted.

IIRC there was a bug in an early version of a certain fighter jet where it would go inverted when crossing the equator. Oops.

Urban legend or so it would appear. https://www.ar15.com/forums/general/Urban_legend_about_F16__... ?

Oh, bummer. That would’ve been a fun case study if it had been true.

Re: Infinite loop in macOS Night Shift in the summer near the Arctic Circle

#94

Post by mantap »

jedberg wrote: post #58
ashton314 wrote: post #53

Earlier quoted context omitted.

I had a friend who once drove around a traffic circle as many times as he could. He got up to 39 times before a police officer pulled him over. Does anybody know if there is a law on that?

Depends on the state/country, but most have rule that you can't go around more than once. In fact, most places I've seen in the US you can't even go more than 3/4s around (although I'm not sure if that's a law or just a posted suggestion).

What the hell? What if you miss your turning or want to do a u-turn? Going around more than once is a perfectly reasonable thing to do.

Re: Infinite loop in macOS Night Shift in the summer near the Arctic Circle

#95

Post by Mountain_Skies »

lwansbrough wrote: post #90
ncmncm wrote: post #78

Earlier quoted context omitted.

Because there is neither a 12:00 am, nor a 12:00 pm. One is 12 noon, the other is 12 midnight. AM and PM are "ante meridian" and "post meridian": before" and after . But 12 is on* the meridian; neither one. You can meaningfully say 12:00:01 am, or 11:59:59 pm, but for 12 sharp nobody can say whether am or pm is dark or day. Airlines schedule flights at 12:01 for this reason.

Meridian in this context is noon. 12 “anti meridian” is 12 hours before noon. 12am. Which is exactly correct. I’m no domain expert but I’m guessing flights are scheduled at 12:01am because people are bad at time. For instance some people would think 12am is the last minute of the previous day instead of the first minute of the next day. 12:01 removes the potential ambiguity.

12 "post meridian" is 12 hours after noon. 12pm. Which is midnight. But you don't use 12pm to mean midnight. Why not? Midnight doesn't actually belong to a day at all. Our current conventions of 12am and 12pm seem to be mostly products of digital time keeping.

Re: Infinite loop in macOS Night Shift in the summer near the Arctic Circle

#96

Post by astrange »

underwater wrote: post #27
randartie wrote: post #17

Am I the only person who is impressed with this person's debugging skill?

The machine gave two big hints. The fan spinning up indicated the computer was needlessly busy. Then the Activity Monitor revealed the problem was the "core brightness" system. From there it is a small leap to make the connection to Night Shift. On mobile devices the only indications we have that something is wrong is warm devices and lower battery lives, which are far less immediate. And we don't have the detailed C…

You can get much more useful info out of Activity Monitor by running spindump.

For iOS the Battery settings are usually good at telling you about power drain.

Re: Infinite loop in macOS Night Shift in the summer near the Arctic Circle

#97

Post by cheerlessbog »

mantap wrote: post #94
jedberg wrote: post #58

Earlier quoted context omitted.

Depends on the state/country, but most have rule that you can't go around more than once. In fact, most places I've seen in the US you can't even go more than 3/4s around (although I'm not sure if that's a law or just a posted suggestion).

What the hell? What if you miss your turning or want to do a u-turn? Going around more than once is a perfectly reasonable thing to do.

What if it's a magic roundabout? [1]

[1] https://en.m.wikipedia.org/wiki/Magic_Roundabout_(Swindon)

Re: Infinite loop in macOS Night Shift in the summer near the Arctic Circle

#98

Post by stordoff »

jedberg wrote: post #58
ashton314 wrote: post #53

Earlier quoted context omitted.

I had a friend who once drove around a traffic circle as many times as he could. He got up to 39 times before a police officer pulled him over. Does anybody know if there is a law on that?

Depends on the state/country, but most have rule that you can't go around more than once. In fact, most places I've seen in the US you can't even go more than 3/4s around (although I'm not sure if that's a law or just a posted suggestion).

Doesn't appear to be the case in the UK at least:

> It is illegal to circle a roundabout more than 3 times

> FALSE

> There is no evidence to support this, other than the 'careless driving' argument. You should plan before you enter a roundabout and circling more than twice could be considered as careless driving.

https://www.endsleigh.co.uk/blog/post/false-driving-myths/

See also https://www.reddit.com/r/policeuk/comments/6ouamr/how_many_t...

Re: Infinite loop in macOS Night Shift in the summer near the Arctic Circle

#100

Post by caf »

smudgymcscmudge wrote: post #82
gberger wrote: post #4

'Falsehoods programmers believe about time: - Every day has a sunrise and a sunset'

Aside from having a falsehoods checklist that includes this, how would this be caught by a programmer who isn’t mindful of the fact that you don’t always have a sunset?

Consider the loop conditions (which are clearly non-trivial) and ask "is it certain that this loop will always terminate"?

Presumably in this case you would have arrived at an answer along the lines of "yes, so long as there's always a sunset". Which should then prompt the question: hang on, is there always a sunset? A quick scan over whatever datafile it's using for input should answer that.

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