Hi Fer Thanks for pointing out the mirror sundial calculating feature of Zw2000. But I see a problem with using it in practice, however.
Since a ceiling sundial uses a very small mounted mirror, I think that measuring the exact inclination and declination of such a small mirror would be very difficult when you are locating and mounting the mirror. Because of the "optical lever" effect, the slightest error in locating the mirror translates into a huge error on the dial's ceiling face, making the sunspot appear where it shouldn't. Also, there is the additional problem of physically transferring Zw2000 drawings and/or polar coordinates of hour angles and dial furniture onto the ceiling. These problems are eliminated when you use the "connect the dot" drawing method. 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>
