| ILLUSTRATING TIME'S SHADOW ~ the book itself ~ the online version is up to date as are new CDs etc abbreviated appendix, formula A8.21a needs a definition added as does the free appendices, see below chapter 14 page 122 has a trivial typo - the bottom figure had the hours 10am to 2pm in the wrong order. Jan 18, 2010 ILLUSTRATING TIME'S SHADOW ~ appendices ~ the online version is up to date as are new CDs formula A8.21a was shown as:- z = atan { sin ( ha ) / sin( 90–ha–dec )*tan (lat ) } it should either match appendix 7, and be:- n = atan ( sin( atan( sin ( Ø ) * tan (sun hour angle) ) ) ) tan ( Ø ) * sin( 90 – d – atan (sin ( Ø ) * tan (sun hour angle) ) ) or it should keep that formula except, for A8.21a, add a definition that for the formula:- z = atan ( sin(ha) ) where ha=hour line angle of a surrogate horizontal dial sin( 90 – ha – dec ) * tan ( lat ) the benefit of keeping that formula and adding the definition is that it shows the v-dec derivation 10/20/09 Please download this chapter 16 for book 3, it is much improved on inclined decliners, no corrections, but reworded, better pictorials, and better sequence. NOTE: The online version is up to date, as are new CDs etc. 10/20/09 Please download this chapter 18 for book 3, it is much improved on vertical decliners, no corrections, but reworded, better pictorials, and better sequence. NOTE: The online version is up to date, as are new CDs etc. ILLUSTRATING SHADOWS THIRD EDITION There are some updates, see below click here for updates themselves , and general update notes also 11/18/06 SUNRISE AND SUNSET FORMULA: hsr = arccos( tan(lat) * tan(decl) ) The formula was correct, the note said from noon but it is as the formula says, hour angle. 11/18/06 THE 2 SINE WAVE EOT FORMULA IS BETTER SHOWN AS eot = 7.36*Sin(2*3.1416*(doy-4.21)/365) + 9.92*Sin(4*3.1416*(doy+9.9)/365) 11/1/06 There are some notes on altitude and azimuth dials not being latitude portable. The following note is more accurate. "Hour angle dials use the hour angle around the style and can easily be latitude corrected by tilting. Italian and Babylonian hours are not corrected when a dial is tilted because they depend on the Earth's curvature [which causes sunset/rise] at a specific latitude. Azimuth and altitude dials may be ported across latitudes but rigid polar alignment must be retained." 11/26/06 Pages 168, 170 of chapter 10 and page 258 of appendix 8 have the formula for hour lines for inclined decliners, the angle produced is from the vertical, the notes say noon. Corrected in the downloadable files for book 2, the download page is here and needs a userid/password to actually download. 4/11/07 Chapter 8, Figure 8.5 in Illustrating Shadows, winter and summer solstice names were reversed. 12/31/07 Page 175 has spurious text "INCLINES" and "RECLINES" due to a Microsoft Word bug. 3/16/08 Pages 115, 156 typo in hh.h and mm for DL, also appendix pages 250-270 now DL hh.hh are 2 significant digits. 11/26/08 The second page of magnetic declinations has EAST and WEST switched. Download it from book 3 appendices now. If the print date of your book is later than the above dates, then your book has the changes incorporated. ILLUSTRATING MORE SHADOWS updates 12/31/07 Page 89 has the words "winter solstice" for both the lower and upper curves, as this is a vertical dial, the lower curve should say "summer solstice". 2/3/08 Page 217 has a C program with a line:- printf ("Uncorrected hour line angles \n" ) ; the line should read:- printf ("Corrected hour line angles \n" ) ; 11/26/08 The second page of magnetic declinations has EAST and WEST switched. Download it from book 3 appendices now. If the print date of your book is later than the above dates, then your book has the changes incorporated. |
| July 2010 |
| ALL BOOKS ARE ONLINE AND UPDATED IN: The book 3 appendices are free, and book 3 itself is yours to download if you email for the userid/password |
| Illustrating Time's Shadow ISBN 0-9765286-8-1 plus 0-9765286-9-X Lib Cong 2005900674 plus 2006930654 Merges Illustrating Shadows and Illustrating More Shadows, deletes duplicated material, and techniques that are complex and replaced by easier methods, adds new material. Hands on, empirical, geometric, trigonometric, CAD, and spreadsheet dial design for small dials plus garden dials using common masonry supplies, clay, and glass, with emphasis on many calendar line techniques, and inclined decliners, while providing details on the use of DeltaCAD programming including the animation of many sheets as parameters vary. Case studies abound with associated problems solved, and cover the infamous inclined decliner, as well as all the other kinds of outdoor dials. The printed book comes with a CD of booklets, spreadsheets, VRML/WRL files, templates, etc with the printed book. The CD has all books and booklets and programs along with source code. You can get the printed book and CD, just the CD, or an online download here. |