Dear Fellow Dialists I promised photos of my newest sundial and they are now on my web site. A set of pictures is at
http://www.wengersundial.com/dialPicture.html The photo at http://www.wengersundial.com/dial1.html shows the detail of the analemma and the scribed features of the dial. This photo is relavent to the recent discussions of analemmas and their placement on sundials. On my globe the significance of the analemma is apparent. Each analemma represents the geographical position of the sun at mean time 6, 7, 8, 9, etc. for each day of the year. In fact the geographical postions of the sun at those mean time hours would be a collection of 365 dots but the analemma is interpolated to generate a semi continuous curve. Since the set of dots that would be generated during the following year would be slightly different the curve used represents some sort of average of the dots over a four year period. The generation of an analemma on another type of sundial involves a projection of these geographical positions through the origin of the globe onto some surface, usually a horizonal or vertical plane. The photos are detailed and my take some time to download. Hope you enjoy them. Dan Wenger
