PGF and TikZ -- Graphic systems for TeX

I am trying to draw an analog clock to teach elementary students how to tell time. Unfortunately I am not able to complete it because I don't know how to layout the node from 1-12. Also, how do you draw the arrow at various time?

\documentclass{minimal}
\usepackage{tikz}
\begin{document}

\begin{centering}

% Define a few constants for easy configuration
\def\radius{2cm}
\def\onedegrad{1.8cm}
\def\fivedegrad{1.75cm}
\def\tendegrad{1.7cm}
\def\labelrad{1.6cm}

\begin{tikzpicture}[scale=1]
  % adding a subtle gray tone to add a bit of "personality"
  \shade[shading=radial, inner color=white, outer color=gray!15] (0,0) circle (\radius);

  \draw (0,0) circle (\radius);
  \draw[fill=black] (0,0) circle (.06mm);
  \node[draw, circle, inner sep=.2mm] (a) at (0,0) {};

  % helper lines
  %\foreach \x in {0, 30, ..., 360} \draw[very thin, gray!40] (a) -- (\x:\radius);

% main lines
  \foreach \x in {0, 6,...,360} \draw (\x:\onedegrad) -- (\x:\radius);

% labels and longer lines at every 6 degrees
  \foreach \x in {0,30,...,330}
  {
    \node[scale=0.5] at (360-\x+90:\labelrad) {\x};
    \draw (\x:\tendegrad) -- (\x:\radius);
  };

\end{tikzpicture}
\end{centering}

\end{document}

Thank you, John

Hi John You can do it by extending your already made foreach statement. I have also added a command which lets you easily drawn the time. You can then yourself extend with coloring the lines! :D

\documentclass{minimal}
\usepackage{tikz}
\begin{document}

\begin{centering}

  % Define a few constants for easy configuration
  \def\radius{2cm}
  \def\onedegrad{1.8cm}
  \def\fivedegrad{1.75cm}
  \def\tendegrad{1.7cm}
  \def\labelrad{1.6cm}
  \def\longline{1.6cm}
  \def\shortline{.6cm}
  \def\drawtime(#1:#2){
      \pgfmathparse{90-#1 *30-#2 *.5}
      \edef\tmpA{\pgfmathresult}
      \draw (0,0) -- (\tmpA:\shortline);
      \pgfmathparse{90-#2 *6}
      \edef\tmpA{\pgfmathresult}
      \draw (0,0) -- (\tmpA:\longline);
  }
  \begin{tikzpicture}[scale=1]
    % adding a subtle gray tone to add a bit of personality
    \shade[shading=radial, inner color=white,outer color=gray!15] (0,0) circle (\radius);

    \draw (0,0) circle (\radius);
    \draw[fill=black] (0,0) circle (.06mm);
    \node[draw, circle, inner sep=.2mm] (a) at (0,0) {};

    % helper lines
    % \foreach \x in {0, 30, ..., 360} \draw[very thin, gray!40] (a) -- (\x:\radius);

    % main lines
    \foreach \x in {0, 6,...,360} \draw (\x:\onedegrad) -- (\x:\radius);

    % labels and longer lines at every 6 degrees
    \foreach \x/\clock in       {30/1,60/2,90/3,120/4,150/5,180/6,210/7,240/8,270/9,300/10,330/11,360/12} {
        \node[scale=0.5] at (360-\x+90:\labelrad) {\clock};
        \draw (\x:\tendegrad) -- (\x:\radius);
    }
    % Here is the time drawn
    \drawtime (4:33)
  \end{tikzpicture}
  \end{centering}

  \end{document}

Hope this helps!

Kind regards Nick