Meanwhile, in Austin, Texas
Jun. 22nd, 2017 01:41 pm![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
conulySunset is the same time as in NYC, but sunrise is an hour later.
So... from here to Wavre, the time of sunset is different this time of year but the time of sunrise is the same. And from here to Austin, the time of sunset is the same this time of year but the time of sunrise is different. But on the other solstice, it's the other way around - Austin and NYC share a sunrise time, Wavre and NYC share a sunset time.
There is some way this all makes sense, and I know I've had it explained to me before, but... I guess it didn't make enough sense. (It has something to do with how the sun appears to move in a figure 8?)
Semi-related, Mr. "How did they know it was noon?" reminded me of something. There is an algorithm to convert sundial time to clock time, and vice versa. Apparently, when mechanical clocks first became common, their time was considered inaccurate, and true time was sundial time. This is blindingly obvious the second you hear it explained, but it didn't occur to me until I happened to read it on Wikipedia while looking up common sundial mottoes. (It's later than you think!)
There must have been a middle period in there where the younger generation was chronically annoying the older generation by showing up for things at clock time when the older generation obviously meant real time.
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So... from here to Wavre, the time of sunset is different this time of year but the time of sunrise is the same. And from here to Austin, the time of sunset is the same this time of year but the time of sunrise is different. But on the other solstice, it's the other way around - Austin and NYC share a sunrise time, Wavre and NYC share a sunset time.
There is some way this all makes sense, and I know I've had it explained to me before, but... I guess it didn't make enough sense. (It has something to do with how the sun appears to move in a figure 8?)
Semi-related, Mr. "How did they know it was noon?" reminded me of something. There is an algorithm to convert sundial time to clock time, and vice versa. Apparently, when mechanical clocks first became common, their time was considered inaccurate, and true time was sundial time. This is blindingly obvious the second you hear it explained, but it didn't occur to me until I happened to read it on Wikipedia while looking up common sundial mottoes. (It's later than you think!)
There must have been a middle period in there where the younger generation was chronically annoying the older generation by showing up for things at clock time when the older generation obviously meant real time.
The Deseret Alphabet, a 38-Letter Writing System Developed by Mormons
Pictures: Colored Honey Made by Candy-Eating French Bees (There's something to pointlessly engineer - flowers with multicolored nectar to make multicolored honey! If they think they can sell pink pineapples, colorful honey is sure to be a hit. And it won't be garbage, so it won't be gross.)
Census: US growing older and more racially diverse
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Medieval medical books could hold the recipe for new antibiotics
Man sent home from work for wearing shorts in over 30°C heat comes back in a dress
Memory for stimulus sequences distinguishes humans from other animals
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How the Liberal Arts Help Veterans Thrive
Urban agriculture only provides small environmental benefits in northeastern US
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Abused children find Japan’s shelters provide little comfort
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no subject
Date: 2017-06-22 09:11 pm (UTC)I'm pulling some of those numbers out of my hat, but sunrise here was 5:07 AM EDT this morning, and sunset will be 8:25 PM EDT. Correcting for daylight savings gives sunrise at 4:07 AM and sunset at 7:25 PM: that's seven hours and 53 minutes from sunrise to noon by the clock, and only seven hours and 25 minutes from then until sunset. So sundial noon was at 11:46 AM EST, or 12:46 EST. (New York City official time is closer to solar time than Boston's.)
no subject
Date: 2017-06-23 04:06 am (UTC)Because if it's the latter, I don't think that holds up. Otherwise I'd expect it to be the same at both ends of the day, and also at noon.
no subject
Date: 2017-06-23 11:50 am (UTC)I'm guessing that the New York/Austin thing is the sort of "coincidence" that you can turn up if you look at enough data. The way it's interesting that New York and Madrid are at the same latitude, but it's not a meaningful coincidence that some city in the United States is at the same latitude as the capital of Spain.
no subject
Date: 2017-06-23 02:19 am (UTC)no subject
Date: 2017-06-23 04:06 am (UTC)