[ExI] clock fans

[ilsa]

https://www.newgeography.com/content/001449-the-forty-fifth-parallel

On Sun, Nov 5, 2023, 10:56 AM spike jones via extropy-chat <
extropy-chat at lists.extropy.org> wrote:

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> Today USians went thru the semiannual ritual of setting our clocks back an
> hour.  This means more sunlight in the morning.  But of course the sunrise
> continues to get a few minutes later each week for the next coupla months.
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> The weekend on which we set our clocks is not the equinox.  So how do they
> figure out which weekend to set the clocks?
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> A long time ago I heard the notion that they choose it such that there is
> an hour difference between sunrise time today and sunrise time on the
> latest sunrise of the year, so that USians wake up at the darkest time of
> the year thrice: the day before the fall time change, the latest sunrise in
> the first week of January, then the day after we undo the silliness in the
> spring.
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> However… it doesn’t work that way.  For USians living way north, the
> difference between sunrise times varies greatly over the year, whereas
> those in the southern USA, such as Florida where I cheerfully squandered my
> own childhood and youth, the time doesn’t vary as much.  So in the south
> USA, the hour time change overcompensates for the varying sunrise time, but
> up north it undercompensates.
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> So… there is a latitude where it really does what I heard it was designed
> to do: make the first week of November, the first week of January and the
> second week of March the darkest wakeup weeks.
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> Without even solving an equation, I looked up and found that latitude.  I
> did it the lazy-man’s way: picking a city, asking for its sunrise table,
> seeing if the delta between now and 5 Jan is greater or less than an hour,
> choosing another city.  Got it on the second try.  That latitude is…
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> … do you want to try it?  Or just scroll down?
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> OK then, scroll down.  The breakeven latitude is…
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> …about 45 degrees north.
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> OK then, I shoulda figured out that is the logical place to design the
> system.
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> spike
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