| ILLUSTRATING TIME'S SHADOW ~ the book itself 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 has the hours 10am to 2pm in the wrong order. Jan 18, 2010 ILLUSTRATING TIME'S SHADOW ~ the free appendices 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. 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. 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. |
| January 18, 2010 please download the new revised vertical decliner chapter, no corrections, but all pictorials and text rewritten and resequenced |
| ALL BOOKS ARE ONLINE AND UPDATED IN: book 1, and book 2 [ email me with the email you used when you bought the books for the current userid and password ] Also, book 3 appendices are free, and book 3 itself is yours to download if you acquired book 1 or two in printed form, on CD or by download online. And available now. |
| Illustrating Time's Shadow ~ 400 printed pages plus the big CD ~ $30 + s&h The appendices ~ $10 + s&h This book is Illustrating Shadows merged with Illustrating More Shadows with duplication and older obtuse methods removed, and much new material added Thus, the predecessor books are no longer for sale (but are on free the CD) This book merges Illustrating Shadows (book 1) and Illustrating More Shadows (book 2) content, re-sequenced, while adding new material and deleting some lesser used or duplicative methods. Small portable and large garden dials are covered, and multiple media such as PVC, wood, paper, concrete, copper, glass, and clay. Summaries on programming various systems and languages, and two CAD systems. The book itself is available as a 24mb approx download - free to download if you acquired the predecessor printed, CD or online books, use the same userid/password you were given, or if your userid/password expired, email me for a new set. Check the table of contents here. The printed book comes with a CD with the original books (Illustrating Shadows and Illustrating More Shadows) as well as Illustrating Time's Shadow, and all the many programs and extras. Get the printed book ($30), the printed appendices ($10), or both ($40), all plus s&h using PayPal here. This book is available on CD as well as online ($10 usd), you print it locally ~ the CD and online option has all books in full color. The Appendices in full are also downloadable for free |