Densest population band
Well, I was joking of course, but let's look at this seriously. If we take a band through Sydney (34 degrees latitide), just wide enough to include the stadium, which is 220m diameter, the band's area will be 4 * .220 * cos(34), which is 7300 square km. As for the South Pole Station, the information at http://205.174.118.254/nspt/ric/station_.htm says it houses 148 people within 250m of the pole, which gives a density of 750 per square km. If our band through Sydney has the same density it must include 5.4 million people. The population of Sydney is only 3.7 million. The entire population of New South Wales is only 5.6 million. You're going to have to cram them all into another 51 stadiums to beat the South Pole. Even the Olympic Games won't achieve that, I suspect. Chris === Chris Lusby Taylor Email: [EMAIL PROTECTED] (Formerly [EMAIL PROTECTED]) ===
Ibn al Shatir sundial
I received the following request. If anyone has the information, please post it and I will pass it on to the one who asked. -- original request: -- I am an architect from Boston Massachusetts. Our firm is doing research for a project in Kuwait I came across your web site while looking for sundials in hopes of finding images of the great sundial of ibn al shatir (damascus 1371) would you know of any links or books on this great sundial? any information would be helpful. thanks
Re: Ibn al Shatir sundial
The book by R.J.R. ROHR Les Cadrans Solaires displays a picture of that sundial with a long description on pp 173-176 of the french edition. This book was translated in german ( 'Die Sonnenuhr', Geschichte, Theorie, Funktion. Verlag Callwey München, 1982). There is also an US edition (Sundials - History Theory and Practice by Rene RJ Rohr, Dover Publications, 31 E 2nd. St., Mineola, NY 11501). Jean-Paul Cornec LANNION FRANCE 48°44'24 N - 3°27'26W
Re: A Pole at the Pole
Mike Shaw I am rather disappointed to learn that there isn't an Mike Shaw actual pole sticking out of the earth at the South pole to Mike Shaw mark the spot. I wonder if there is one at the North pole? Mike Shaw It would be really neat to drop an equatorial dial plate Mike Shaw over it and create an instant sundial, even if it would Mike Shaw only work for six month in each year - one at each pole Mike Shaw needed! Who'll volunteer to make the expedition? Mike Shaw (I knew we would get back on topic eventually) Mike Shaw Mike Mike Shaw [EMAIL PROTECTED] Mike Shaw 53.37N 3.02W The location of the pole (axis of rotation) changes. The following is extracted from an earlier email message I sent to this list: Jim Cobb The earth's axis of rotation differs from its axis of figure Jim Cobb (the maximum moment of inertia). The rotation axis moves Jim Cobb slowly around the axis of figure in a quasi-circular path. Jim Cobb The maximum amplitude of the polar motion is typically about Jim Cobb 0.3 arc seconds (about 9 meters on the surface of the Jim Cobb earth). This motion has principal periods of 365 and 428 Jim Cobb days. Finally, the motion is affected by unpredictable Jim Cobb geophysical forces and is determined from observations. Jim Cobb Jim Cobb I consulted The Astronomical Almanac, 1999, page B 60 for Jim Cobb most of the above information. The Explanatory Supplement Jim Cobb to the Astronomical Almanac contains further information Jim Cobb about polar motion, including a graph of about fifteen years Jim Cobb worth of such motion. Jim --- -- | Jim Cobb | 540 Arapeen Dr. #100 | [EMAIL PROTECTED] | | Parametric| Salt Lake City, UT | (801)-588-4632 | | Technology Corp. | 84108-1202 | Fax (801)-588-4650 | --- -- Think like a man of action, act like a man of thought. -- Henri Bergson
Re: A Pole at the Pole
I am rather disappointed to learn that there isn't an actual pole sticking out of the earth at the South pole to mark the spot. Perhaps there is one at the South Pole (and also a sundial in that case). Try: http://www.spole.gov/internet/photos/0111halo/ I will try to find out for sure from someone who was there recently. Les Cowley Atmospheric halos http://dspace.dial.pipex.com/lc/halo/halosim.htm
A Pole at the Pole
I am rather disappointed to learn that there isn't an actual pole sticking out of the earth at the South pole to mark the spot. I wonder if there is one at the North pole? It would be really neat to drop an equatorial dial plate over it and create an instant sundial, even if it would only work for six month in each year - one at each pole needed! Who'll volunteer to make the expedition? (I knew we would get back on topic eventually) Mike [EMAIL PROTECTED] 53.37N 3.02W
