  The Wiener index $W(G)$ is the sum of distances of all pairs of vertices of
the graph $G$. The Wiener polarity index $W_{p}(G)$ of a graph $G$ is the
number of unordered pairs of vertices $u$ and $v$ of $G$ such that the distance
$d_{G}(u,v)$ between $u$ and $v$ is $3$. In this paper the Wiener and the
Wiener polarity indices of sun graphs are computed. A relationship between
those indices with some other topological indices are presented. Finally, we
find the Hosoya (Wiener) polynomial for sun graphs.
