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%\usepackage{czech}

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 \usepackage
  [pdftex,bookmarksopen=true,
   pagebackref,  
   pdfview=FitB,
   pdfauthor = {Jan\ Hollan},
   pdftitle  = {Maps for Globe at Night},
   ]
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\begin{document}
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\centering

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Maps for \href{http://www.globeatnight.org}{Globe at Night}
latitude \ensuremath{\mathbf{20^\circ}},
YYYY-MM-DD, 21 h local time 
(Sun at \ensuremath{-}x°), transparent air.
The brightest star is
\href{http://en.wikipedia.org/wiki/Toliman}{Toliman}
(\ensuremath{\alpha} Centauri).
Central star 
\href{http://en.wikipedia.org/wiki/Acrux}{Acrux} 
(the brightest one in the Cross) is
51\ensuremath{^\circ} left from the south,
at 58\ensuremath{^\circ} height. 
Detailed maps 33\ensuremath{^\circ} vertically,
the first four maps 100\ensuremath{^\circ}.
\emph{\href
{http://amper.ped.muni.cz/jenik/astro/maps/GaN/}
{Jan Hollan}, \href{http://www.czechglobe.cz/}{CzechGlobe}}

\end{document}