We don't just sell books on this website. We gaze upwards at the sky from time to time until we get dizzy and giddy from the effort.
You just don't know what the press and media are going to come up with next. March's full moon has been re-labled as a
super-moon in the bag of tricks to get your attention. For those of you who are not privy to astronomy and its subtleties, our lunar neighbor (that would be the Moon), goes through a complex cycle that repeats. Depending on the use, there is a metatonic cycle and also a Saros cycle, which are the different measurements of the moon in relation to the earth and the sun. The complete cycle takes over 18 years to go through all its permutations. Here is a picture from the full moon on March 18.
For some reason, the closest approach of the moon in this cycle, the perigee (we get the word mixed up with apogee), is occurring this month, and the other part of this is that people are getting excited about it. There is one guy, a so-called professional astrologer, who claims that catastrophes will occur. The answer of the scientists, especially geologists and astronomers is, that there is no correlation. Of course, the recent events in Japan have probably made this guy's career and website skyrocket, since even a prediction based on faulty premises can occasionally come true. And the moon goes back and forth in its orbit around the earth all the time. We remember hearing on a radio show that a linear particle accelerator was affected because of its size and length, by the moon's movements.
But the guy who made the statement, as we remember it was wrong. He said it was a daily occurrence, and when we did a little search engine research, it turns out it was twice a day. And it was not the moon that caused the misalignment of the particle accelerator, it was the fact the tides that came up on the shore during the monthly lunar cycle would push down on the beach and the underlying land. The extra weight and the proximity of the accelerator to the shore would gently move the carefully aligned path of the accelerator a tiny fraction. But even the tiny fraction was enough to disturb the delicate calibration of this huge device. Here is a PDF file from Stanford, which if you have some time, contains some of the most fascinating information we have ever seen on the different forces at work (earthquakes, lunar effects and more) when they were building the Linear Accelerator, back in the day.
http://www.slac.stanford.edu/cgi-wrap/getdoc/slac-pub-5756.pdfHere is how the paper ends, with a bit of advice to the prospective engineer on calculating all the possible factors in designing your facility:
So, if some day, in some distant control room you are trying to make your machine run, please remember
that you may have to correct for the phase of the moon, the weather, the level of the ground water, the traffic on nearby roads, or whether you closed the door to the tunnel and turned out the lights.
If you are (and maybe dear reader you might) building some pharaoh-like gigantic project that is kilometers long or high, or is exposed to the titanic astronomical forces of extra-planetary forces, you may wish to review some of the data. Or, more practically you are measuring subtle variations in the fabric of space-time by detecting the motion of the elusive, mystical pull of somewhat still-theoretical gravitational waves. If you are not, it is still filled with fascinating tid-bits of information.
Here is another photo of the "supermoon" of March.