Change of Pace — and Puzzle

Tuesday, February 2nd, 2010

I will say more in the very near future about the Obama administration’s decision on the NASA budget, which was the subject of my last post. Today, however, I’d like to offer a change of pace. When I began this blog, I intended to include posts about the moon in our culture in addition to posts on the science of the moon. So far, however, I’ve done very little of the former.

I read only two web comics on a regular basis: Sinfest, written by Tatsuya Ishida, and Piled Higher and Deeper, written by Jorge Cham. Yesterday, Tatsuya had a delightful comic that has to do … sort of … with the moon.

"Sinfest," Feb 1 2010

Probably no explanation of this strip is necessary. But if any of you are curious,  Sinfest is sort of about modern life and sort of about religion and is highly irreverent about both. It’s definitely satirical but I would not say it’s anti-religious. It just pokes fun at the little foibles of all religions. (Except Islam — I’ve never seen Ishida say anything, pro or con, about Islam, probably because that can be hazardous to a cartoonist’s health.)

The little Buddha on a cloud and the dog (named Pooch) are recurring characters. Every now and then Ishida draws a strip where he illustrates how the Japanese symbol (kanji) for some word could plausibly come about. I like these calligraphy strips very much. He usually plays it very straight. The humor lies, to me, in the whole idea of rationally explaining something as irrational as language. You could do the same thing with English spellings.

I’m not completely sure what the “mu!” at the end of yesterday’s strip means. When I go online and look up the free English-Japanese dictionaries, it’s easy enough to find out that the kanji shown here is pronounced “tsuki” and means “moon.” On the other hand, “mu” means “six.” Can anyone explain to me what six has to do with the moon? Or what the point of the joke is otherwise? (Perhaps “mu” is how dogs bark in Japanese?)

Tags: comics, kanji, Tatsuya Ishida
Posted in Just for Fun, Popular culture, websites | 3 Comments »

There is No Santa Claus; Is There an Enterprise?

Saturday, January 30th, 2010

For months we’ve been waiting to hear what the Obama administration response would be to the Augustine Commission report on the future of NASA’s manned space flight program. Now it looks as if we have our answer, and it ain’t pretty.

The Augustine Commission outlined four possible directions for NASA. The last two were called “Flexible Path” and “Moon First.” The first two could be called “Moon Never” (though the report used different names). The commission further argued that in order to have a human space program that our country could be proud of, NASA’s budget would have to be augmented by about $3 billion per year.

As reported here and here and many other places, it looks as if President Obama has now placed his bets on the more ambitious of the two versions of “Moon Never.” Here is what I wrote about this option in my post from September:

Moon Never, ISS on Life Support. Slightly more palatable, this option also abandons hope for sending humans beyond low Earth orbit, but it at least acknowledges that it would be a disgrace to build a space station for 25 years, operate it for 5 years, and then torpedo it. The Augustine committee said that we can keep the ISS going to 2020 by developing a smaller heavy-launch rocket and relying on commercial companies to generate cheaper alternatives for launching humans into orbit.

This pretty much describes what I have read about the proposal Obama is going to send to Congress, although we can now paint in a few more details. There is some talk that the space budget will increase by $1 billion per year (not $3 billion per year). In early January, the word was that this money was going to go to NASA but now looks as if it might go in part toward incentives for private companies to build launch solutions. Obama is definitely scuttling the Constellation program and its associated rocket, the Ares I-X. This is a bridge-burning move. Even if we changed our minds and wanted to send astronauts to the moon by 2020, or even the mid-2020s, without Constellation we wouldn’t have the hardware to get them there.

Of course I am disappointed by this decision. However, it was not the least bit surprising. In today’s economy, with talk of a budget freeze on discretionary spending, where was Obama going to find $3 billion? I consider some of the online criticism of his decision to be disingenuous; I suspect that many of his critics would have jumped on him, perhaps even harder, if he had chosen to ask Congress for another $3 billion per year for NASA.

I’m disappointed that Obama didn’t take more seriously the commission’s finding that NASA needed this money to have any kind of credible manned flight program. It wasn’t really a choice between $18 billion and $21 billion. It was a choice between $18 billion flushed down the toilet, or $21 billion producing tangible results.

I’m disappointed also that there was no acknowledgement of the fact that, after the discoveries this fall concerning lunar water, the moon is actually an interesting destination again. Even if we concede that short-term financial considerations prevent us from having a viable human spaceflight program for a few years, a leader who was truly committed to space would outline a long-term strategy and a rationale that would include sustainable presence in space as its #1 objective. The best arguments I have seen in that direction are the ones on Paul Spudis’s blog. When you make that the rationale, the moon becomes a required destination, not an optional one.

However, I do see some reason for optimism in Obama’s decision, bleak as it may seem. It really does mark a break with the past. Gone is the pretense that NASA can do everything. Until now, there was always the hope that there was a Santa Claus, that the U.S. government or taxpayers would somehow step in and make NASA’s wishes come true. It’s possible that this was in some way holding back the efforts of private companies and investors to think creatively about what they could accomplish in space.

Now, there is no other game in town. We will only get as far in space as international partners and private companies, such as SpaceX, can take us. Lovers of free enterprise should be delighted; this is a chance to show that entrepreneurs can be better at “the vision thing” than presidents. For the near future, it seems, we are hitching our wagon to a starship named Enterprise.

I personally have some doubts. I’m not sure that space exploration companies are ready to walk on their own two feet. But we are going to find out, one way or the other.

A metaphor for the future of human spaceflight?

(Image from www.startrek.com.)

Tags: Augustine Commission, Barack Obama, disappointment, Flexible Path, reality, sustainability, the vision thing
Posted in Arrive, Future exploration, Media, NASA, Popular culture | 1 Comment »

New Year, Halos and Blue Moons

Sunday, January 3rd, 2010

Here in Santa Cruz, New Year’s Eve brought an unusual coincidence of two astronomical events. One of them was a worldwide event: It was the second full moon of the month, or a “blue moon.”

The usage of the term “blue moon” to mean the second full moon in a calendar month actually stems from a mistake in Sky and Telescope magazine in March 1946! This article on Sky and Telescope‘s website explains how the confusion arose. However, as the authors note, the new definition is “like a genie that cannot be forced back in the bottle.”

How often do blue moons occur? That is a very interesting question that you can figure out for yourself if you look at the chart on the bottom of page 2 of the article. The chart reveals an interesting fact that the authors do not mention: blue moons happen on a 19-year cycle.

To see this, notice that 1999 began with blue moons in January and March. Nineteen years later, the year 2018 will begin in exactly the same way. Why is that? Well, 19 is sort of a magic number for moon-lovers. It turns out that 19 solar years are almost exactly equal to 235 lunations. (A “lunation” is the time between one full moon and the next.) So that means if you have a full moon on December 31 this year, you will most likely again have a full moon on December 31 nineteen years from now.

There are only two things that can mess up this pattern. First of all, there is a tiny 2-hour discrepancy between 19 solar years and 235 lunar months, which eventually (over a period of twelve 19-year cycles) will move the full moon forward a day. The other discrepancy results from Leap Day. If you look again at the Sky and Telescope diagram, you’ll see that the blue moon of 2001 (in November) does not match the blue moon of 2020 (in October). According to our 19-year rule, they should be in the same month each year, but the blue moon in 2020 gets pushed forward a month because of the extra day that is inserted in February that year.

This 19-year cycle was very important in ancient times, because many cultures used both a lunar and a solar calendar. To bring the two into rough correspondence, you need 7 intercalated or “extra” months every 19 years. (That is, in 19 years there are 19 x 12 “regular” months, plus 7 “extra” months, for a total of 235.) The rule was discovered by Meton of Athens in 432 BC, and is therefore known as the Metonic cycle.

Unlike the Athenians, we use a purely solar calendar. The “months” in our calendar are no longer lunations; they are merely convenient fictions. For that reason, also, the Metonic cycle no longer has any direct effect on your life — unless you happen to be the kind of person who pays attention to blue moons!

By the way, there is one other intriguing thing about that Sky and Telescope chart. I have said that there are 7 “extra” full moons every 19 years, and so you would think there would also be 7 blue moons. But actually, that isn’t quite correct! If you look at the chart, you will count 8 blue moons from 1999 through 2017! Where did the extra one come from?

The problem is, once again, February. In 1999 there were no full moons at all in February, and therefore we had two in March as well as two in January. Thus, from 1999 through 2017 (the current Metonic cycle) we will have 8 months with an “extra” full moon and one month (February 1999) with none. In other words, we will have a NET of 7 “extra” full moons, just as we are supposed to.

**************

As I mentioned, there was other wonderful astronomical phenomenon on New Year’s Eve. This one was local, rather than global. When I went outside at ten minutes before midnight, I was stunned to see a beautiful, huge halo around the moon — just like the one in the photo at the beginning of this post. (By the way, that is not my photo. It was taken by an Aussie photographer named Anthony James, who kindly gave me permission to post it in my blog. Click here to see his Flickr page, which specializes in beautiful nighttime imagery.)

A lunar halo is much easier to understand than a blue moon. It is formed in the same way as a rainbow, by the refraction of light off of ice crystals or drops of water in the atmosphere. That night was very misty and cloudy here in Santa Cruz. In fact, according to the newspaper, we weren’t supposed to be able to see the moon at all that night. However, by 11:50 PM enough of the haze had evaporated that the moon was very clearly visible. However, there were no stars — it was as if everything in the sky had been turned off except this enormous eye looking back down at me.

That’s really what it looked like — an eye, or the photographic negative of one. The lunar halo looks like the iris and the moon looks like the pupil (white, instead of black!). I think that Anthony’s picture gives you some idea of the effect.

What an incredible night–a blue moon, an eye in the sky, and the beginning of the year, all at once! I’m certain that combination will never happen again in my lifetime.

Tags: eye in the sky, Flickr, lunar calendar, Metonic cycle, Sky and Telescope, solar calendar
Posted in Just for Fun, Popular culture, Science | 2 Comments »