Uh oh, someone mentioned math. The guy who came up with this also happens to have an abiding interest in the problem. He wrote a good summary of the then-current state (2002) of the n-dimensional sphere packing problem (from 2 to 128 dimensions) here. How many integer sequences did you discover today? (for fun, try the web cam...).
Friday, May 30, 2008
Why I will never get an iPhone
Too much information. One problem with "persistent" memory like flash is it's sometimes not obvious whether or not it's really gone away.
Wednesday, May 28, 2008
Sats
So when you are bored at work, you end up in weird places. (I know, you are nervous about clicking that link.)
I never appreciated the scale difference between low earth orbit satellites and geostationary ones. I noticed that it seems sort of crowded out there. "How many satellites can actually fit in geostationary orbit?" Well, figuring out that problem seemed much more interesting than examining a huge database of misclassified Accounts Payable.
Here's what I came up with from my searching, rough back of the envelope:
geosynch orbit = 35,600 km
earth width = 12,800 km
circum @ orbit = 263,900 km
+- latitude = 10 dg
+- latitude (tan 10 dg) = 7,400 km
+- altitude = 200 km (higher than that is where sats go to die)
+- positioning of sats = 35 km (margin of error)
min distance between sats = 10 km (made that up)
passing lane east = 35,600 + 35 + 10 + 5 = 35,650-35,800 km
passing lane west = 35,600 - 35 - 10 - 5 = 35,400-35,550 km
# of belts of satellites = 2 (also made up)
Total # of satellite slots @ geostationary orbit = (7400*2/45)*(263,900/45)*2 = 3.86MM.
I'm sure there are more limitations--like it is too expensive to keep satellites in a precise orbit, so most wobble in altitude and latitude. Also, if 70% of the earth is water, you have a lot of coverage where you don't need it. The point is, we can fit a lot more.
Saturday, May 24, 2008
Shigeru Miyamoto is pretty much where I would like to be, when I'm 55.
Thursday, May 22, 2008
Why I cancelled Netflix
Edit: This content is actually from www.hulu.com, go there instead for better selection and total avoidal of Comcast.
Remington Steele? Check. 30 Rock? Check. Airwolf? Check. Arrested Development? Check. I'm violently anti-Comcast, but they've got something good going (good like I pay 0 dollars per month instead of 60 dollars per month): http://www.fancast.com.
Monday, May 19, 2008
Thursday, May 08, 2008
Friday, May 02, 2008
HD Division
So I made the plunge and bought a the middle of the road Mac Book (first blog post from the new putar). I am going to install Vista on the drive (am I hearing boos and hisses?) but I am wondering about how much disk space to put on each partition. It all hinges on a fairly n00b question that I can't find the answer to--I know they use different file systems, but is the data from OS X available for Windows to read? For example, do I need two copies of my music? How do you guys have your Macs divided? Do you even boot it up into OS X ever? I am considering giving OS X a try, to see if I like it better than windows. (more boos and hisses?)
Thursday, May 01, 2008
Music, anyone?
I came across this the other day and just started playing with it now. Record songs from (online) radio and automatically archive them for future listening:
http://www.chilirec.com/
I've been particularly enjoying the ability to find and listen to music that isn't normally accessible to me, such as songs in French and Swedish.
(And no, I was not only attracted to it because it's from Sweden...)