Hello fellows in sundialling
I assure you I strived a lot to avoid bringing this problem to you. I can not hide from you the fact that it humilates me. But I still think my ignorance chagrins me more than my failure. So, here I am, humbly asking you to help me one more time with something that should be a child's play... but is knocking me down. Perhaps because I am not a child? Following the instructions found on pages 78-85 of Albert E. Waugh's "Sundials - Their Theory and Construction" I built a N 20 W decliner. It is in place and working fine. Than I went to build the dials for the other faces. Alas! After two weeks of nightly work I am still mystified, completely bewildered with the results I gotten so far. Applying the recipé I found the following: (The algorithm is described pages 78-86.) Data: Phi = 15.7513 Wall: E 20 N The angles I found are: SD (sub-style distance) = -50.4886 (tan SD = sin D * cot Phi) SH (style height) = 64,7434 (sin SH = cos D + cos Phi) DL (difference in longitude) = -53,2830 (cot DL = cot D * sin Phi) AV (6o'clock angle ) = 84.4898 (cot AV = sin D * tan Phi) Converting DL into time units I have 3,5522 = 3 h 33 m 8 s Hour angles from sub-style position are as follows: 1 113.76 2 97.42 3 80.85 4 64.55 5 48.88 6 34.00 7 19.80 8 6.07 Sub-style 9 7.50 10 21.26 11 35.52 12 50.48 13 66.23 14 82.58 15 99.14 16 115.44 17 131.11 18 145.99 19 160.19 20 173.92 21 187.50 22 201,26 23 215.52 24 230.00 I've calculated the hour for a full 24-hour dial just as a way to double check my calculation. Also, I've done all the number checking that the author recomends. They all indicate the results are good. Nevertheless, when I built the model and put it in place... it does not work. Can somehelp me before I lose my hair? Something must be wrong. But what? What? - fernando PS -- Both Abert Waugh and René R. J. Rohr say that in a vertical dial the 12 o'clock line is always vertical. Nevertheless, I've noticed this is not the case for a vertical direct west (or east) dial. Have I found a hint here? -- Fernando Cabral Padrao iX Sistemas Abertos mailto:[EMAIL PROTECTED] http://www.pix.com.br mailto:[EMAIL PROTECTED] Fone: +55 61 321-2433 Fax: +55 61 225-3082 15º 45' 04.9" S 47º 49' 58.6" W 19º 37' 57.0" S 45º 17' 13.6" W