%%%% sundl_03.txt
%%%% Created by Laurence D. Finston (LDF) Wed Oct 10 23:48:29 CEST 2007

%% $Id: sundl_03.txt,v 1.6 2007/10/11 11:44:41 lfinsto1 Exp $

%% * (1) Copyright and License.

%%%% This file is part of GNU 3DLDF, a package for three-dimensional drawing. 
%%%% Copyright (C) 2007, 2008 The Free Software Foundation

%%%% GNU 3DLDF is free software; you can redistribute it and/or modify 
%%%% it under the terms of the GNU General Public License as published by 
%%%% the Free Software Foundation; either version 3 of the License, or 
%%%% (at your option) any later version. 

%%%% GNU 3DLDF is distributed in the hope that it will be useful, 
%%%% but WITHOUT ANY WARRANTY; without even the implied warranty of 
%%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
%%%% GNU General Public License for more details. 

%%%% You should have received a copy of the GNU General Public License 
%%%% along with GNU 3DLDF; if not, write to the Free Software 
%%%% Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

%%%% GNU 3DLDF is a GNU package.  
%%%% It is part of the GNU Project of the  
%%%% Free Software Foundation 
%%%% and is published under the GNU General Public License. 
%%%% See the website http://www.gnu.org 
%%%% for more information.   
%%%% GNU 3DLDF is available for downloading from 
%%%% http://www.gnu.org/software/3dldf/LDF.html. 
%%%% It is also available from 
%%%% http://www.dante.de/software/ctan/, the Dante www-server  
%%%% and from http://wwwuser.gwdg.de/~lfinsto1, 
%%%% the author's website.  

%%%% Please send bug reports to lfinsto1@gwdg.de
%%%% The mailing list help-3dldf@gnu.org is available for people to 
%%%% ask other users for help.  
%%%% The mailing list info-3dldf@gnu.org is for the maintainer of 
%%%% GNU 3DLDF to send announcements to users. 
%%%% To subscribe to these mailing lists, send an 
%%%% email with ``subscribe <email-address>'' as the subject.  

%%%% The author can be contacted at: 

%%%% Laurence D. Finston 
%%%% Kreuzbergring 41 
%%%% D-37075 Goettingen 
%%%% Germany 

%%%% lfinsto1@gwdg.de 
%%%% s246794@stud.uni-goettingen.de 

%% * (1)

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%% ** (2)

%% *** (3) 

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\iftrue % \iffalse
\pageno=-1
%\pageno=0
\vskip.5cm
\centerline{Sundials 3}
\vskip\baselineskip
\centerline{Laurence D. Finston}
\vskip\baselineskip
\centerline{Last updated:  October 11, 2007}
\vskip2cm
%\centerline{\hskip.5cm\epsffile{3DLDFmp.0}}
%
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{\small
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%\hskip1cm
\vbox{\vskip2\baselineskip
This document is part of GNU 3DLDF, a package for three-dimensional
drawing.
\vskip\baselineskip

Copyright (C) 2007, 2008 The Free Software Foundation
\vskip\baselineskip

GNU 3DLDF is free software; you can redistribute it and/or modify 
it under the terms of the GNU General Public License as published by 
the Free Software Foundation; either version 3 of the License, or 
(at your option) any later version. 
\vskip\baselineskip

GNU 3DLDF is distributed in the hope that it will be useful, 
but WITHOUT ANY WARRANTY; without even the implied warranty of 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
GNU General Public License for more details. 
\vskip\baselineskip

You should have received a copy of the GNU General Public License 
along with GNU 3DLDF; if not, write to the Free Software 
Foundation, Inc.,\hfil\break
51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
\vskip\baselineskip

See the GNU Free Documentation License for the copying conditions 
that apply to this document.
\vskip\baselineskip

You should have received a copy of the GNU Free Documentation License 
along with GNU 3DLDF; if not, write to the Free Software 
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA}}
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%% *** (3) Contents

\advance\voffset by 1in
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\iftrue % \iffalse
\ifnum\pageno<0\else\pageno=-1\fi
\begingroup

\parindent=0pt
\parskip=0pt
\advance\baselineskip by 2pt
\dimen0=15cm

\centerline{\bf Contents}
\vskip 2cm
%\hbox to \dimen0{Projection onto Equatorial Plane %
%(Same for Any Latitude)\leaderfill 1}
%
%% **** (4) 
%
\hbox to \dimen0{Perspective Projections\hfil}

\hbox to \dimen0{Jerusalem, Israel 
                 $31^\circ$ $47'$ N, $35^\circ$ $13'$ E
                 \leaderfill \the\currpg}
\global\advance\currpg by 1
\hbox to \dimen0{Athens, Greece $37^\circ$ $58'$ N 
                 $23^\circ$ $43'$ E\leaderfill \the\currpg}
\global\advance\currpg by 1
\hbox to \dimen0{Chicago, Illlinois, USA 
                 $41^\circ$ $52'$ $55''$ N $87^\circ$ $37'$ $40''$ W
                 \leaderfill \the\currpg}
\global\advance\currpg by 1
\hbox to \dimen0{London, UK $51^\circ$ $30'$ $28''$ N 
                 $0^\circ$ $7'$ $41''$ W\leaderfill \the\currpg}
\global\advance\currpg by 1
\hbox to \dimen0{G{\"o}ttingen, Germany $51^\circ$ $32'$ N 
                 $9^\circ$ $56'$ E\leaderfill \the\currpg}
\global\advance\currpg by 1
\hbox to \dimen0{St.~Petersburg, Russia
                  $59^\circ$ $56'$ N, $30^\circ$ $20'$ E\leaderfill \the\currpg}
\global\advance\currpg by 1
%%
%% Jerusalem
%%
\hbox to \dimen0{Jerusalem, Israel 
                 $31^\circ$ $47'$ N, $35^\circ$ $13'$ E\hfil}
\hbox to \dimen0{\hskip2em Perspective projection\leaderfill \the\currpg}
\global\advance\currpg by 1
\hbox to \dimen0{\hskip2em Vertical Dial, Facing Due South\leaderfill \the\currpg}
\global\advance\currpg by 1
\hbox to \dimen0{\hskip2em Horizontal Dial\leaderfill \the\currpg}
\global\advance\currpg by 1

%%
%% Athens
%%
\hbox to \dimen0{Athens, Greece $37^\circ$ $58'$ N 
                 $23^\circ$ $43'$ E\hfil}
\hbox to \dimen0{\hskip2em Perspective projection\leaderfill \the\currpg}
\global\advance\currpg by 1
\hbox to \dimen0{\hskip2em Vertical Dial, Facing Due South\leaderfill \the\currpg}
\global\advance\currpg by 1
\hbox to \dimen0{\hskip2em Horizontal Dial\leaderfill \the\currpg}
\global\advance\currpg by 1
%%
%% Chicago
%%
\hbox to \dimen0{Chicago, Illlinois, USA 
                 $41^\circ$ $52'$ $55''$ N $87^\circ$ $37'$ $40''$ W\hfil}
\hbox to \dimen0{\hskip2em Perspective projection\leaderfill \the\currpg}
\global\advance\currpg by 1
\hbox to \dimen0{\hskip2em Vertical Dial, Facing Due South\leaderfill \the\currpg}
\global\advance\currpg by 1
\hbox to \dimen0{\hskip2em Horizontal Dial\leaderfill \the\currpg}
\global\advance\currpg by 1
%%
%% London
%%
% latitude := 51.5777 %% London
\hbox to \dimen0{London, UK $51^\circ$ $30'$ $28''$ N 
                 $0^\circ$ $7'$ $41''$ W\hfil}
\hbox to \dimen0{\hskip2em Perspective projection\leaderfill \the\currpg}
\global\advance\currpg by 1
\hbox to \dimen0{\hskip2em Vertical Dial, Facing Due South\leaderfill \the\currpg}
\global\advance\currpg by 1
\hbox to \dimen0{\hskip2em Horizontal Dial\leaderfill \the\currpg}
\global\advance\currpg by 1
%%
%% Goettingen
%%
\hbox to \dimen0{G{\"o}ttingen, Germany $51^\circ$ $32'$ N 
                 $9^\circ$ $56'$ E\hfil}
\hbox to \dimen0{\hskip2em Perspective projection\leaderfill \the\currpg}
\global\advance\currpg by 1
\hbox to \dimen0{\hskip2em Vertical Dial, Facing Due South\leaderfill \the\currpg}
\global\advance\currpg by 1
\hbox to \dimen0{\hskip2em Horizontal Dial\leaderfill \the\currpg}
\global\advance\currpg by 1
%%
%% St.~Petersburg, Russia $59^\circ$ $56'$ N, $30^\circ$ $20'$ E
%%
\hbox to \dimen0{St.~Petersburg, Russia 
                 $59^\circ$ $56'$ N, $30^\circ$ $20'$ E\hfil}
\hbox to \dimen0{\hskip2em Perspective projection\leaderfill \the\currpg}
\global\advance\currpg by 1
\hbox to \dimen0{\hskip2em Vertical Dial, Facing Due South\leaderfill 19}
\global\advance\currpg by 1
\hbox to \dimen0{\hskip2em Horizontal Dial\leaderfill \the\currpg}
\global\advance\currpg by 1
%%
\endgroup
\vfil\eject
\fi

\advance\voffset by -.5in
\advance\hoffset by -1in

%% **** (4) End of contents

%% *** (3) Page 0 (conditional)

%\iftrue
\iffalse
\pageno=0

\vbox to \vsize{%
\vskip.5cm
\line{\hskip1cm\epsffile{sundl_03.0}\hss}
\vss
}
\vfil\eject
\fi

%% *** (3) Headline

\iftrue % \iffalse
\headline={Sundials 3\quad Copyright {\copyright} 2007, 2008 The Free Software Foundation\hfil %
   \folio\hfil Author:  Laurence D. Finston\hfil}
\fi

%% *** (3) Perspective projections

\pageno=1

%% **** (4) Jerusalem, Israel 

\vbox to \vsize{%
\vskip1cm
\centerline{{\bf Jerusalem, Israel} 
$31^\circ$ $47'$ N, $35^\circ$ $13'$ E\hfil}
\vskip1cm
\line{\hskip1cm\epsffile{sundl_03.1}\hss}
\vskip1cm
\line{\hskip 2cm{\bf Perspective projection}\hfil}
\line{\hskip 2cm Jerusalem, Israel $31^\circ$ $47'$ N, $35^\circ$ $13'$ E\hfil}
\line{\hskip 2cm Focus:  $\rm{position} = (0, 5, -12)$, %
$\rm{direction} = (0, 5, 10)$, %
$\rm{distance} = 10$\hfil}
\line{\hskip 2cm (dimensions in centimeters)\hfil}
\vss
}

\vfil\eject

%% **** (4) Athens


\vbox to \vsize{%
\vskip1cm
\centerline{{\bf Athens, Greece} $37^\circ$ $58'$ N $23^\circ$ $43'$ E\hfil}
\vskip1cm
\line{\hskip1cm\epsffile{sundl_03.4}\hss}
\vskip1cm
\line{\hskip 2cm{\bf Perspective projection}\hfil}
\line{\hskip 2cm Latitude $41^\circ$ $54'$ N (Athens, Greece)\hfil}
\line{\hskip 2cm Focus:  $\rm{position} = (0, 5, -12)$, %
$\rm{direction} = (0, 5, 10)$, %
$\rm{distance} = 10$\hfil}
\line{\hskip 2cm (dimensions in centimeters)\hfil}
\vss
}

\vfil\eject

%% **** (4) Chicago

\vbox to \vsize{%
\vskip1cm
\centerline{{\bf Chicago, Illinois, USA} 
$41^\circ$ $52'$ $55''$ N $87^\circ$ $37'$ $40''$ W\hfil}
\vskip1cm
\line{\hskip1cm\epsffile{sundl_03.7}\hss}
\vskip1cm
\line{\hskip 2cm{\bf Perspective projection}\hfil}
\line{\hskip 2cm Chicago, Illinois, USA
                 $41^\circ$ $52'$ $55''$ N $87^\circ$ $37'$ $40''$ W\hfil}
\line{\hskip 2cm Focus:  $\rm{position} = (0, 5, -12)$, %
$\rm{direction} = (0, 5, 10)$, %
$\rm{distance} = 10$\hfil}
\line{\hskip 2cm (dimensions in centimeters)\hfil}
\vss
}

\vfil\eject


%% **** (4) London

\vbox to \vsize{%
\vskip1cm
\centerline{{\bf London, UK} $51^\circ$ $30'$ $28''$ N, $0^\circ$ $7'$ $41''$ W\hfil}
\vskip1cm
\line{\hskip1cm\epsffile{sundl_03.10}\hss}
\vskip1cm
\line{\hskip 2cm{\bf Perspective projection}\hfil}
\line{\hskip 2cm Latitude $51^\circ$ $30'$ $28''$ N (London, UK)\hfil}
\line{\hskip 2cm Focus:  $\rm{position} = (0, 5, -12)$, %
$\rm{direction} = (0, 5, 10)$, %
$\rm{distance} = 10$\hfil}
\line{\hskip 2cm (dimensions in centimeters)\hfil}
\vss
}

\vfil\eject

%% **** (4) Goettingen 51 deg. 32' N, 9 deg. 56' E

\vbox to \vsize{%
\vskip1cm
\centerline{{\bf G{\"o}ttingen, Germany} $51^\circ$ $32'$ N, $9^\circ$ $56'$ E\hfil}
\vskip1cm
\line{\hskip1cm\epsffile{sundl_03.13}\hss}
\vskip1cm
\line{\hskip 2cm{\bf Perspective projection}\hfil}
\line{\hskip 2cm Latitude $51^\circ$ $32'$ N (G{\"o}ttingen, Germany)\hfil}
\line{\hskip 2cm Focus:  $\rm{position} = (0, 5, -12)$, %
$\rm{direction} = (0, 5, 10)$, %
$\rm{distance} = 10$\hfil}
\line{\hskip 2cm (dimensions in centimeters)\hfil}
\vss
}

\vfil\eject


%% **** (4) St.~Petersburg $59^\circ$ $56'$ N, $30^\circ$ $20'$ E

\vbox to \vsize{%
\vskip1cm
\centerline{{\bf St.~Petersburg, Russia} 
              $59^\circ$ $56'$ N, $30^\circ$ $20'$ E\hfil}
\vskip1cm
\line{\hskip1cm\epsffile{sundl_03.16}\hss}
\vskip1cm
\line{\hskip 2cm{\bf Perspective projection}\hfil}
\line{\hskip 2cm Latitude $51^\circ$ $32'$ N (G{\"o}ttingen, Germany)\hfil}
\line{\hskip 2cm Focus:  $\rm{position} = (0, 5, -12)$, %
$\rm{direction} = (0, 5, 10)$, %
$\rm{distance} = 10$\hfil}
\line{\hskip 2cm (dimensions in centimeters)\hfil}
\vss
}

\vfil\eject


%% *** (3) Cities

%% **** (4) Jerusalem

\vbox to \vsize{%
\vskip1cm
\centerline{{\bf Jerusalem, Israel} $31^\circ$ $47'$ N, $35^\circ$ $13'$ E\hfil}
\vskip1cm
\line{\hskip1cm\epsffile{sundl_03.1}\hss}
\vskip1cm
\line{\hskip 2cm{\bf Perspective projection}\hfil}
\line{\hskip 2cm Jerusalem, Israel $31^\circ$ $47'$ N, $35^\circ$ $13'$ E\hfil}
\line{\hskip 2cm Focus:  $\rm{position} = (0, 5, -12)$, %
$\rm{direction} = (0, 5, 10)$, %
$\rm{distance} = 10$\hfil}
\line{\hskip 2cm (dimensions in centimeters)\hfil}
\vss
}

\vfil\eject

\vbox to \vsize{%
\vskip2cm
\centerline{{\bf Jerusalem, Israel} $31^\circ$ $47'$ N, $35^\circ$ $13'$ E\hfil}
\vskip1cm
\line{\hskip 2cm\epsffile{sundl_03.2}\hss}
\vskip2cm
\line{\hskip 2cm{\bf Parallel projection onto the vertical plane} (plane of $r_1$)\hfil}
\line{\hskip 2cm Vertical dial facing due south\hfil}
\line{\hskip 2cm Jerusalem, Israel $31^\circ$ $47'$ N, $35^\circ$ $13'$ E\hfil}
\vss}
\vfil\eject

\vbox to \vsize{%
\vskip2cm
\centerline{{\bf Jerusalem, Israel} $31^\circ$ $47'$ N, $35^\circ$ $13'$ E\hfil}
\vskip1cm
\line{\hskip 0cm\epsffile{sundl_03.3}\hss}
\vskip2cm
\line{\hskip 2cm{\bf Parallel projection onto the horizontal plane} (plane of $r_6$)\hfil}
\line{\hskip 2cm Horizontal dial\hfil}
\line{\hskip 2cm Jerusalem, Israel $31^\circ$ $47'$ N, $35^\circ$ $13'$ E\hfil}
\vss}
\vfil\eject



%% **** (4) Athens

\vbox to \vsize{%
\vskip1cm
\centerline{{\bf Athens, Greece} $37^\circ$ $58'$ N $23^\circ$ $43'$ E\hfil}
\vskip1cm
\line{\hskip1cm\epsffile{sundl_03.4}\hss}
\vskip1cm
\line{\hskip 2cm{\bf Perspective projection}\hfil}
\line{\hskip 2cm Latitude $41^\circ$ $54'$ N (Athens, Greece)\hfil}
\line{\hskip 2cm Focus:  $\rm{position} = (0, 5, -12)$, %
$\rm{direction} = (0, 5, 10)$, %
$\rm{distance} = 10$\hfil}
\line{\hskip 2cm (dimensions in centimeters)\hfil}
\vss
}

\vfil\eject


\vbox to \vsize{%
\vskip2cm
\centerline{{\bf Athens, Greece} $37^\circ$ $58'$ N $23^\circ$ $43'$ E\hfil}
\vskip1cm
\line{\hskip 2cm\epsffile{sundl_03.5}\hss}
\vskip2cm
\line{\hskip 2cm{\bf Parallel projection onto the vertical plane} (plane of $r_1$)\hfil}
\line{\hskip 2cm Vertical dial facing due south\hfil}
\line{\hskip 2cm Latitude $41^\circ$ $54'$ N (Athens, Greece)\hfil}
\vss}
\vfil\eject

\vbox to \vsize{%
\vskip2cm
\centerline{{\bf Athens, Greece} $37^\circ$ $58'$ N $23^\circ$ $43'$ E\hfil}
\vskip1cm
\line{\hskip 0cm\epsffile{sundl_03.6}\hss}
\vskip2cm
\line{\hskip 2cm{\bf Parallel projection onto the horizontal plane} (plane of $r_6$)\hfil}
\line{\hskip 2cm Horizontal dial\hfil}
\line{\hskip 2cm Latitude $41^\circ$ $54'$ N (Athens, Greece)\hfil}
\vss}
\vfil\eject

%% **** (4) Chicago

\vbox to \vsize{%
\vskip1cm
\centerline{{\bf Chicago, Illinois, USA} 
$41^\circ$ $52'$ $55''$ N $87^\circ$ $37'$ $40''$ W\hfil}
\vskip1cm
\line{\hskip1cm\epsffile{sundl_03.7}\hss}
\vskip1cm
\line{\hskip 2cm{\bf Perspective projection}\hfil}
\line{\hskip 2cm Chicago, Illinois, USA 
      $41^\circ$ $52'$ $55''$ N $87^\circ$ $37'$ $40''$ W\hfil}
\line{\hskip 2cm Focus:  $\rm{position} = (0, 5, -12)$, %
$\rm{direction} = (0, 5, 10)$, %
$\rm{distance} = 10$\hfil}
\line{\hskip 2cm (dimensions in centimeters)\hfil}
\vss
}

\vfil\eject


\vbox to \vsize{%
\vskip2cm
\centerline{{\bf Chicago, Illinois, USA} 
$41^\circ$ $52'$ $55''$ N $87^\circ$ $37'$ $40''$ W\hfil}
\vskip1cm
\line{\hskip 2cm\epsffile{sundl_03.8}\hss}
\vskip2cm
\line{\hskip 2cm{\bf Parallel projection onto the vertical plane} (plane of $r_1$)\hfil}
\line{\hskip 2cm Vertical dial facing due south\hfil}
\line{\hskip 2cm Chicago, Illinois, USA 
       $41^\circ$ $52'$ $55''$ N $87^\circ$ $37'$ $40''$ W\hfil}
\vss}
\vfil\eject

\vbox to \vsize{%
\vskip2cm
\centerline{{\bf Chicago, Illinois, USA} 
              $41^\circ$ $52'$ $55''$ N $87^\circ$ $37'$ $40''$ W\hfil}
\vskip1cm
\line{\hskip 0cm\epsffile{sundl_03.9}\hss}
\vskip2cm
\line{\hskip 2cm{\bf Parallel projection onto the horizontal plane} (plane of $r_6$)\hfil}
\line{\hskip 2cm Horizontal dial\hfil}
\line{\hskip 2cm Chicago, Illinois, USA
      $41^\circ$ $52'$ $55''$ N $87^\circ$ $37'$ $40''$ W\hfil}
\vss}
\vfil\eject

%% **** (4) London

\vbox to \vsize{%
\vskip1cm
\centerline{{\bf London, UK} $51^\circ$ $30'$ $28''$ N, $0^\circ$ $7'$ $41''$ W\hfil}
\vskip1cm
\line{\hskip1cm\epsffile{sundl_03.10}\hss}
\vskip1cm
\line{\hskip 2cm{\bf Perspective projection}\hfil}
\line{\hskip 2cm Latitude $51^\circ$ $30'$ $28''$ N (London, UK)\hfil}
\line{\hskip 2cm Focus:  $\rm{position} = (0, 5, -12)$, %
$\rm{direction} = (0, 5, 10)$, %
$\rm{distance} = 10$\hfil}
\line{\hskip 2cm (dimensions in centimeters)\hfil}
\vss
}

\vfil\eject


\vbox to \vsize{%
\vskip2cm
\centerline{{\bf London, UK} $51^\circ$ $30'$ $28''$ N, $0^\circ$ $7'$ $41''$ W\hfil}
\vskip1cm
\line{\hskip 2cm\epsffile{sundl_03.11}\hss}
\vskip2cm
\line{\hskip 2cm{\bf Parallel projection onto the vertical plane} (plane of $r_1$)\hfil}
\line{\hskip 2cm Vertical dial facing due south\hfil}
\line{\hskip 2cm Latitude $51^\circ$ $30'$ $28''$ N (London, UK)\hfil}
\vss}
\vfil\eject

\vbox to \vsize{%
\vskip2cm
\centerline{{\bf London, UK} $51^\circ$ $30'$ $28''$ N, $0^\circ$ $7'$ $41''$ W\hfil}
\vskip1cm
\line{\hskip 0cm\epsffile{sundl_03.12}\hss}
\vskip2cm
\line{\hskip 2cm{\bf Parallel projection onto the horizontal plane} (plane of $r_6$)\hfil}
\line{\hskip 2cm Horizontal dial\hfil}
\line{\hskip 2cm Latitude $51^\circ$ $30'$ $28''$ N (London, UK)\hfil}
\vss}
\vfil\eject

%% **** (4) Goettingen 51 deg. 32' N, 9 deg. 56' E

\vbox to \vsize{%
\vskip1cm
\centerline{{\bf G{\"o}ttingen, Germany} $51^\circ$ $32'$ N, $9^\circ$ $56'$ E\hfil}
\vskip1cm
\line{\hskip1cm\epsffile{sundl_03.13}\hss}
\vskip1cm
\line{\hskip 2cm{\bf Perspective projection}\hfil}
\line{\hskip 2cm Latitude $51^\circ$ $32'$ N (G{\"o}ttingen, Germany)\hfil}
\line{\hskip 2cm Focus:  $\rm{position} = (0, 5, -12)$, %
$\rm{direction} = (0, 5, 10)$, %
$\rm{distance} = 10$\hfil}
\line{\hskip 2cm (dimensions in centimeters)\hfil}
\vss
}

\vfil\eject

\vbox to \vsize{%
\vskip2cm
\centerline{{\bf G{\"o}ttingen, Germany} $51^\circ$ $32'$ N, $9^\circ$ $56'$ E\hfil}
\vskip1cm
\line{\hskip 2cm\epsffile{sundl_03.14}\hss}
\vskip2cm
\line{\hskip 2cm{\bf Parallel projection onto the vertical plane} (plane of $r_1$)\hfil}
\line{\hskip 2cm Vertical dial facing due south\hfil}
\line{\hskip 2cm Latitude $51^\circ$ $32'$ N (G{\"o}ttingen, Germany)\hfil}
\vss}
\vfil\eject

\vbox to \vsize{%
\vskip2cm
\centerline{{\bf G{\"o}ttingen, Germany} $51^\circ$ $32'$ N, $9^\circ$ $56'$ E\hfil}
\vskip1cm
\line{\hskip 0cm\epsffile{sundl_03.15}\hss}
\vskip2cm
\line{\hskip 2cm{\bf Parallel projection onto the horizontal plane} (plane of $r_6$).\hfil}
\line{\hskip 2cm Horizontal dial\hfil}
\line{\hskip 2cm Latitude $51^\circ$ $32'$ N (G{\"o}ttingen, Germany)\hfil}
\vss}
\vfil\eject

%% **** (4) St.~Petersburg, Russia $59^\circ$ $56'$ N, $30^\circ$ $20'$ E

\vbox to \vsize{%
\vskip1cm
\centerline{{\bf St.~Petersburg, Russia} 
            $59^\circ$ $56'$ N, $30^\circ$ $20'$ E\hfil}
\vskip1cm
\line{\hskip1cm\epsffile{sundl_03.16}\hss}
\vskip1cm
\line{\hskip 2cm{\bf Perspective projection}\hfil}
\line{\hskip 2cm St.~Petersburg, Russia $59^\circ$ $56'$ N, $30^\circ$ $20'$ E\hfil}
\line{\hskip 2cm Focus:  $\rm{position} = (0, 5, -12)$, %
$\rm{direction} = (0, 5, 10)$, %
$\rm{distance} = 10$\hfil}
\line{\hskip 2cm (dimensions in centimeters)\hfil}
\vss
}

\vfil\eject

\vbox to \vsize{%
\vskip2cm
\centerline{{\bf St.~Petersburg, Russia} 
            $59^\circ$ $56'$ N, $30^\circ$ $20'$ E\hfil}
\vskip1cm
\line{\hskip 2cm\epsffile{sundl_03.17}\hss}
\vskip2cm
\line{\hskip 2cm{\bf Parallel projection onto the vertical plane} (plane of $r_1$)\hfil}
\line{\hskip 2cm Vertical dial facing due south\hfil}
\line{\hskip 2cm St.~Petersburg, Russia $59^\circ$ $56'$ N, $30^\circ$ $20'$ E\hfil}
\vss}
\vfil\eject

\vbox to \vsize{%
\vskip2cm
\centerline{{\bf St.~Petersburg, Russia} 
            $59^\circ$ $56'$ N, $30^\circ$ $20'$ E\hfil}
\vskip1cm
\line{\hskip 0cm\epsffile{sundl_03.18}\hss}
\vskip2cm
\line{\hskip 2cm{\bf Parallel projection onto the horizontal plane} (plane of $r_6$).\hfil}
\line{\hskip 2cm Horizontal dial\hfil}
\line{\hskip 2cm St.~Petersburg, Russia $59^\circ$ $56'$ N, $30^\circ$ $20'$ E\hfil}
\vss}
\vfil\eject


%% **** (4) End here.

\bye

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