$${\Delta t_0 = \frac{\Delta t}{\gamma} = \frac{9,8 \times 10^4\, \mathrm{a}}{3,198 \times 10^{11}} \\ = 3,06 \times 10^{-7}\, \mathrm{a} = \underline{\underline{9,7\, \mathrm{s}}}}$$