How to move chapter number in classicthesis class

Question

I am using classicthesis for my thesis. In each chapter LaTeX puts its number, but I need to move it.

Here you have an screenshot example, in this image I wish to move "4" number to the left.

Answer 1

classicthesis sets the chapter number as a \marginpar if you don't use the linedheaders package option. Regardless, setting of the chapter heading is done with the aid of titlesec. From the actual classicthesis.sty, you'll see:

\ifthenelse{\boolean{@linedheaders}}%
{% lines above and below, number right
\titleformat{\chapter}[display]%             
    {\relax}{\raggedleft{\color{halfgray}\chapterNumber\thechapter} \\ }{0pt}%
    {\titlerule\vspace*{.9\baselineskip}\raggedright\spacedallcaps}[\normalsize\vspace*{.8\baselineskip}\titlerule]%
}{% something like Bringhurst  
\titleformat{\chapter}[display]%
    {\relax}{\mbox{}\oldmarginpar{\vspace*{-3\baselineskip}\color{halfgray}\chapterNumber\thechapter}}{0pt}%
    {\raggedright\spacedallcaps}[\normalsize\vspace*{.8\baselineskip}\titlerule]% 
}

The former \titleformat corresponds to the linedheaders package option, while the latter is without. You could provide your own updated version:

\titleformat{\chapter}[display]%
  {\relax}{\vspace*{-3\baselineskip}\makebox[\linewidth][r]{\color{halfgray}\chapterNumber\thechapter}}{0pt}%
  {\raggedright\spacedallcaps}[\normalsize\vspace*{.8\baselineskip}\titlerule]% 

I've placed the chapter number in a box of width \linewidth, right-aligned.

\documentclass{report}
\usepackage{classicthesis,lipsum}% http://ctan.org/pkg/{classicthesis,lipsum}
\titleformat{\chapter}[display]%
  {\relax}{\vspace*{-3\baselineskip}\makebox[\linewidth][r]{\color{halfgray}\chapterNumber\thechapter}}{0pt}%
  {\raggedright\spacedallcaps}[\normalsize\vspace*{.8\baselineskip}\titlerule]%
\begin{document}
\chapter{First chapter}
\lipsum
\end{document}

Perhaps, in a more general setting, any of the adjustments possible and/presented in the titlesec documentation would work, many of which you'll find on this site.