3 ms·
>one of the best arguments for standard time all year around! [...], this time will be in sync with their circadian rhythm. And this can be guaranteed best with
by jasode 7y ago
>one of the best arguments for standard time all year around! [...], this time will be in sync with their circadian rhythm. And this can be guaranteed best with standard time.
To clarify because of possible imprecision around the word "standard". I think what you're saying is that circadian regularity is best achieved with "unchanging" time instead of "standard" time.
There's Standard (capital 'S') time where the high point of the sun roughly at ~12pm. And then there's Daylight Saving time where the high sun is roughly at ~1pm. A circadian rhythm can be compatible with either of those systems if it's kept the same all year long.
- Riesling 7y agoSorry for being imprecise, but I actually meant Standard Time (as in noon at about 12pm). Our circadian rhythms are not as flexible as many people think. There are many studies showing that people sleep less if the sun sets later, causing a net sleep loss with related health problems.
- taeric 7y agoYou know solar noon is not necessarily noon. Right? Pretty sure it changes throughout the year, too. If so, that seems more an argument for dst. I'll check in a bit. Someone may just know, though.
- kgwgk 7y agoSolar noon changes a bit through the year, but the range is just half an hour: https://www.sundials.co.uk/eot https://www.sundials.co.uk/eot
- taeric 7y agoOdd, this would seem to be a data point for DST being just half an hour. That said, that chart is suspicious for not having jumps for DST. How does that work?
- kgwgk 7y agoDST doesn’t have anything to do with the oscillation of the true noon at any location by +/-15 minutes around the year (that cycle is not even summer/winter).
- taeric 7y agoHow? Noon literally shifted by an hour per last night. So there should be a jump in the chart. Not a smooth line. A jump.
- kgwgk 7y agoThe chart shows at what time noon happens when you have a 24-hour clock calibrated to get it right on average. For example, a clock showing GMT assuming you’re in Greenwich. If you add or subtract hours to your clock instead of keeping a 24 hours day length then yes, you will have jumps. But those jumps are caused by you playing with the clock, they are not real. The fact that Daylight Savings Time exists doesn’t have anything to do that the duration of the day is sometimes a few seconds longer and sometimes a few seconds shorter than 24 hours. If noon was always 24 hours after the previous one the line in that chart would be flat. With discontinuities if you want to include DST shifts in the chart, but I really don’t see the interest in doing so. The rationale for applying DST has nothing to do with that variation, it would be just the same if the time from noon to noon was always 24 hours.
- taeric 7y agoThis feels like a classic case of talking past each other. First, I will acknowledge you answered precisely what I asked. Thank you. I would like to get DST back in context, since it is in that context that I asked. The assertion seemed to be that solar noon being at local noon had some advantages. I agree that is begging the question to assume it, but I am just exploring the consequences. So, assuming I was asking for drift of solar noon to local noon, we have to account for our messing with the clock. Because we do and did. Would there be advantage to us having a mechanism that more closely aligned them? More, what would that mechanism look like? I was guessing that it would look similar to DST, just with 30 minute swings, not 60.
- tbabb 7y ago> if the sun sets later The sun sets when it sets. We are choosing what clock label to put on that moment. Getting up an hour earlier and thinking of the same clock position as "later in the day" is exactly the same as using DST— except clock noon and solar noon won't be permanently misaligned.