Hi All, > Maria wrote:
> As the equinox September 22 approaches are there any > measurements that would-be sundial makers should be taking? > I recall a few comments about the unique qualities of shadows > on this date. There is one interesting thing you can do which doesn't even involve that messy business of going out of doors. Go to the NASS Website and click on "Current Data". Observe the map and note the shape of the terminators. On the Equinox they will be straight vertical lines dividing the earth into equal areas of sunlight and darkness - instead of the usual "sine wave" curve. If you go now you can see the lines approaching that shape. http://sundials.org Bob Terwilliger NASS Webmaster
