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The Rotation Problem

Given the latitude and longitude of a prior planetary rotation axis (or pole), and given a set of latitude and longitude points defining a number of features on the surface of the planet, determine the latitude and longitude points describing the location of the features in the prior rotational regime.

I know.  Someone’s already solved this problem.  His name was Euler, and he did it in a more general case. So much more general, that all of the descriptions I can find of his solutions are a little opaque.

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Short lineaments aren’t just noise

I’m now able to successfully discriminate plausible NSR fits by:

  • calculating several “good” fits, that is, any local minimum in the fit curve that is within 10% of the overall curve’s amplitude, of the minimum fit.
  • screening these good fits based on whether or not endpoint doppelgangers generated at those amounts of backrotation are with in an MHD of less than 0.1*lin.length() of lin.

This screening process:

  • almost always results in a unique best fit
  • screens out many bad fits (because even at their minima, they can’t create synthetic lineaments)
  • very occasionally permits more than one fit to be included as good enough

I think it’s good enough to be able to avoid doing the monte carlo thing for now.

I looked at several bands of lineament length, especially the short ones, to see if there were perhaps a trend toward noise in the shorter lineaments, which is what I would expect, given how easy it is for them to fit somewhere in backrotational space. But it turned out that they still display approximately the same aggregate fit curve and activity histogram:

Only the shortest lineaments tend toward noise.
Only the shortest lineaments tend toward noise.

It would be good to create a map of the lineaments, color coded by where their good fits occur, and compare that to the map of resolution and illumination angle that I got from Trent, just to see if there’s any kind of correlation.

Now I need to transform the lineaments into the paleo-orientation suggested by Schenk and Nimmo, and re-run the analysis, to see if magically, that shell orientation gives a more convincing story.

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The Cold Box is Chillin’

With the final batch of cider done fermenting, I turned the temperature down to 5°C last night to chill everything for storage, flocculation, carbonation, and dispensing! I also hooked up the gas and the taps. The leak on the CO2 tank isn’t actually at the regulator-tank junction where I’d thought originally, it’s somehow in the main valve on the tank… and so unfixable from my point of view. But… hopefully it can be traded in for a new tank anyway. 50 gallons of brew all in all: 1 mead, 3 beers, and 6 ciders. We’ll definitely have to have a coming out party in September.

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Juno

Michelle and I watched Juno last night. It was surprisingly good. I don’t know why it was surprising, but it was. A wonderful storyline to have for reference in your brain. Spoiler alert. Don’t keep reading if you haven’t seen the movie.

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Why not a godless angel band?

It’s not too often that I play a song on infinite repeat, but yesterday I left Angel Band, the last song on the O Brother, Where Art Thou sound track, going for more than an hour. It’s based on an American hymn written and set to music in 1860 by Jefferson Hascall and William Bradbury, (who also wrote Jesus Loves Me).

My latest sun is sinking fast,
My race is nearly run,
My strongest trials now are past,
My triumph has begun.

O, come, angel band,
Come and around me stand,
O bear me away on your snow white wings,
To my immortal home.
O bear me away on your snow white wings
To my immortal home.

O bear my longing heart to him
Who bled and died for me
Whose blood now cleanses from all sin
And gives me victory

O, come angel band
Come and around me stand
O bear me away on your snow white wings,
To my immortal home.
O bear me away on your snow white wings,
To my immortal home.

The Stanley Brothers performed the version in O Brother, Where Art Thou. It’s almost a capella, with four part harmony, and some guitar and mandolin in the background. It’s a simple song. A comforting deathbed song. I disagree entirely with every sentiment expressed in it, but it’s still moving, almost to the point of tears.

How can that be? And how can it be that I don’t know any naturalistic hymns that are similarly moving? Do they exist, but not get played? Is it a failure of community? Or do they not even exist? Have we not yet had enough time to phrase our understanding of the natural world in emotionally captivating ways? Does it take a thousand years to do that? Or do they not exist because we don’t have naturalistic communities? Or because those naturalistic communities that do exist don’t actually value the fact that they are a community – because they’re not willing or able to do the work required to cultivate and maintain themselves as a community?

I wish there were a similarly moving song about exponential population growth, and the subsequent collapse. Something that might come to mind when someone came across a growth rate stated as a percentage. They’d say “Oh, I know how this story ends – all exponential growth is unsustainable.” We need a kind of pre-emptive post-apocalyptic lament. Stories in verse, set to music, about the ways in which we will have failed. They’d hardly be any more distant from our everyday experience than songs about Passover. Or a set of garden hymns… songs in praise of the organisms that make the nutrients in our composted waste available, the sunshine that distills seawater into rain, the hungry ladybugs, the earthworms aerating our soil, chlorophyll, and the plants that have cooperated in their own domestication. The last song could be like Angel Band, but with our bodies being returned to the garden that nourished us, to nourish our remaining family.

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Note to my CA state reps on water conservation

Regarding: AB2175 (2008) (PDF)

Dear Senator Scott and Assemblyman Portantino,

I’ve recently come across AB2175, a bill aimed an improving water conservation in California. I am strongly in favor of the provisions it details, especially with the looming $10 billion water bond measure we face this fall. However, I am disturbed to see that it includes no real improvement of agricultural water use. As I’m sure you know, ~70% of the water used in California is used for agriculture, and it is not used efficiently, because it is sold at far below cost to farmers (and at far below the rates that residential and commercial water customers pay). No serious water conservation effort can leave agricultural water efficiency out as this bill does. Instead of a vague and unspecified target for agricultural users to be established in 2009, we need a hard number now, before we start investing tens of billions of dollars in new water infrastructure for our state. Agribusiness has had a free ride on water for long enough. If we really have a water problem now (and I believe we do) it’s time for them to do their part in the conservation effort, and footing the bill for new infrastructure.

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Parkwood Tomatocide

I give up. The tomatoes just aren’t tomatoing. The three cherry tomatoes on the S. side of the back house in 5 gallon pots just won’t stay wet enough with my attention span. They’re crispy. The fruits they have made are leathery and dry, so out they go. The 2 year old Cherokee Purple is likewise fruitless, and turning itself into an arbor crossing the already very narrow walkway. I pruned it back to just the new green growth coming out of the stumps. I think I’ll move the habañros over there now.

There’s definitely a psychological pattern with the garden. So far anyway. Excitement early on, with rapid new green growth, and then confusion. Am I doing this right? Am i overwatering? Is there something wrong? And then less watering. But maybe too much less. And somehow, the plants take it – they put up with it anyway. It seems to take a lot to actually get them to wilt. once they’re a little woody. But maybe it’s enough to keep them from fruiting? And now despair. Something terribly wrong. 40 tomato plants and 10 tomatoes.

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Is Contraception the New Abortion?

I ran across this article at Science Progress, about efforts to aggressively enforce the Weldon (or “church”) amendments, which make it illegal to compel a health care worker to provide a service they find morally objectionable.  The author focuses on the possibility that the new rules would change the definition of conception from the time of embryo implantation, to the time of conception – but really, what they do (if you read the PDF) is give broad freedom to all medical personnel to decide for themselves what exactly they do and don’t find conscionable.  Which sounds fine of course, from a libertarian point of view.  But it also sucks if you happen to have accidentally gotten pregnant in Montgomery, AL, or some rural town in North Dakota.  It seems like the rules are so broad as to allow a doctor to refuse to prescribe birth control to an unmarried woman.  Additionally annoying is that this is just another example of the Feds bullying the states with money they took from the state’s citizens – the rule only applies to institutions that take federal money… like just about every public hospital (if there are any left that is…), and it will have the effect of shifting federal funding to conservative institutions, insofar as liberal ones are willing to refuse the federal funding in order to be able to require their personnel to perform all legal and medically advisable procedures.

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Luther Burbank’s Children

On the way out to Bodega Bay yesterday we stopped in Sebastopol at the Luther Burbank Experimental Farm, or what’s left of it anyway – all but three acres of an original 18 have been sold off. It is disheveled, and there are no guided tours, just a few acres of numbered plants, mostly fruit and nut trees, that you can look up on a brochure and map in a box by the barn. That didn’t matter at all. It’s a wonderful place.

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A Summer Brewsday

We procrastinated until the heat of the summer, imagining that we could get cold, hydrating, beer from Mark at Craftsman if push came to shove. Then it turned out that, pending the brewery expansion, his beer is all spoken for by existing commercial customers. Horror!