ILLUSTRATING TIME'S SHADOW ~ DeltaCAD macros ~ online versions are up to date

Oct 6, 2011 DeltaCAD v-dial macros: MAIN-v-dials.bas and MAIN-v-dials[f].bas  had a typo in choice 7, the legend said
LAT when it should show LAT and COLAT.    

ILLUSTRATING TIME'S SHADOW ~ Excel/Open Office ~ online versions are up to date

Oct 23, 2011 The v-dial analemma removed (it is best worked using the DeltaCAD macros). The spreadsheet analemma
is mostly for illustrative purposes, which is why the more common h-dial analemma was retained..  

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

the inclined decliner chapter was split into two chapters, no substantive change, just a better sequence.     Aug/Sep 2011

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


                                                                                          


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.
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 the book and booklets and programs along with
source code.  You can get the printed book and CD, just the CD, or an online download here.
October 23, 2011