\[\boxed{\mathbf{956.}}\]
\[1\ мин = \frac{1}{60} \cdot 15{^\circ} = \frac{15{^\circ}}{60} = 0,25{^\circ}.\]
\[0,25{^\circ} = \frac{1}{4} \cdot 60 = 15^{'}.\]
\[1\ с = \frac{1}{60} \cdot 0,25{^\circ} = \left( \frac{1}{240} \right){^\circ}\ .\]
\[\left( \frac{1}{240} \right){^\circ} = \frac{1}{240} \cdot 3600 = 15^{''}.\]
\[Ответ:15{^\circ};15^{'};15^{''}.\]