Hello All Does anybody remember the exact ratio or multiplication factor that will determine the width of the a shadow's edge penumbra if you know the distance from the style to the penumbra's image? Isn't the penumbra's with about 1/100th the projection distance? And couldn't this ratio be viewed in graphic or tabular form?
I ask because I'd like to be able to calculate the theoretical penumbra width at different points along the Kitt Peak Sundial perimeter timelines. John John L. Carmichael Jr. Sundial Sculptures 925 E. Foothills Dr. Tucson Arizona 85718 USA Tel: 520-696-1709 Email: [EMAIL PROTECTED] Website: <http://www.sundialsculptures.com> -
