\magnification=\magstep1

$$
P^2 \quad = \quad {{ 4 \pi^2}\over{G (m_1 + m_2) }} \thinspace a^3
$$

$$
{\rm spindown\ timescale\ \ } T \quad = \quad 
       {{P}\over{{\dot{P}}}}
    \quad = \quad
       {{P}\over{{{dP/dt}}}}
$$

$$
{\rm Period\ \ } P \quad = \quad 0.089218 {\rm \ s}
$$

$$
{{dP}\over{dt}} \quad = \quad 
      { {4.38 \times 10^{-5} {\rm \ s}} \over { 3.456 \times 10^{8} {\rm \ s}} }
   \quad = \quad 
        1.267 \times 10^{-13} 
$$

$$
T \quad = \quad { {0.089218 {\rm \ s}} \over {1.267 \times 10^{-13} } }
   \quad = \quad 
            7.0 \times 10^{11} {\rm \ s} 
   \quad = \quad 
            22,000 {\rm \ yr}
$$



\bye

