cellio: (moon-shadow)
[personal profile] cellio
I bought a new calendar today and, to my surprise, among the candle-lighting times on each page it lists Pittsburgh. (Usually we don't make the cut.) While looking at this I noticed that sunset in September is moving by about 12 minutes per week, but that in March it only moves by about 8 minutes a week. Shouldn't it be symmetrical? (The delta for sunrise and sunset changes over the course of the year, with the widest swings being at equnoxes and the smallest ones at solstices. I grok that; I don't grok that they don't match.)

Friday night I saw something unusual at services: a man lit candles and a woman made kiddush and there was no special occasion dictating that. For all that egalitarianism is a core principle in my movement, I don't think I have ever seen a woman make kiddush in our sanctuary before, unless there were special circumstances (sisterhood service, a bat mitzvah, etc). Gee, maybe there's hope that someday I will be offered that honor after all. (There's still another barrier: there is a strong meme of giving that pair of honors to a couple. This was violated this week, too.)

Yesterday morning after services our newest rabbi (hmm, I need a shorthand notation for him -- the others are "senior rabbi" and "associate rabbi") talked with the group about adult education. He wanted to know what we want to learn, when we want to learn it, and how we want to learn it. It was a good discussion; I wish im luck in distilling down feedback that, in aggregate, meant "all of it". :-) He seemed a little surprised by the idea that, actually, we'd love to learn on Shabbat -- ideally right after services, but late afternoon leading into havdalah would be acceptable to some. I hope that idea bears fruit. (Of course, he was asking the group of people who self-selected to stay around after services for the discussion... but every option doesn't need to appeal to every congregant, only to a critical mass. And we also discussed the idea of giving the same class multiple times, in different kinds of timeslots -- a teacher's dream, but for some reason we don't tend to do it.)

At the end of the discussion he said something interesting, so after it broke up I asked him "did you just imply that you're available for individual study?" and he said yes. Heh. I'll be in touch.

Short takes:

I assume that everyone has by now seen Jon Stewart on election hypocrisy. You might not have seen Language Log's discourse analysis on Karl Rove.

(I have not posted about the election; it's not because I don't care, but because there's so much as to overwhelm and lots of other people are already posting good, thoughtful pieces.)

I recently found myself in a discussion about internet discussions and used the phrase on the internet nobody knows you're a dog. I later went looking for the cartoon; it shouldn't surprise me that it has a Wikipedia entry, but it did surprise me a little that Google suggested the phrase after I'd typed only "on the internet". That real-time search-guessing thing is good sometimes. (I also went looking for a recipe for a dish I ate last night at Ali Baba's, and when I'd typed only "mujdara" it offered two completions, "recipe" and "calories".)

Speaking (sort of) of internet discoveries, this article from Real Live Preacher taught me about the Caganer, a figure we don't often see in nativity scenes these days but apparently quite normal in times past.

This article on using the internet for identity theft (link from Raven) didn't have anything new for me, but it's a good summary to give to people just getting started. It did remind me how annoying I find the canned security questions used by most banks -- things like "mother's maiden name" and "city of your birth" were way too easy to crack even before the net was ubiquitious. (And the ones that aren't tend to be non-deterministic, like "favorite color".) Fortunately, in most cases your bank doesn't really care about the answer; it's just a password. So lying adds security at little cost, assuming you can remember the lie. (What do you mean my first pet wasn't named "as375m~@z"? :-) )

(no subject)

Date: 2008-09-07 06:34 pm (UTC)
ext_87516: (Default)
From: [identity profile] 530nm330hz.livejournal.com
It's asymmetric because there are two inputs: there's the speed of the Earth's revolution (which affects the displacement between sidereal noon and mean solar noon) and then there's the length of daylight (which affects the distance between sidereal noon and sunset). Length of daylight is a sine wave with minimum at the winter solstice, average at the equinoxes, and maximum at the summer solstice; displacement of noon is a different sine wave with maximum at aphelion and minimum at perihelion. That's also why the earliest sunset is in the first week of December; although daylight is still getting shorter it's close enough to the minimum that the first derivative is close to zero, but we're so close to perihelion that the first derivative of noon displacement is close to its maximum. (See Kepler's second law)

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