  Results of a comparative analysis of the $^{214}$Po ($T_{1/2}= 163.47\pm0.03$
$\mu$s), $^{213}$Po ($T_{1/2}=3.705 \pm 0.001$ $\mu$s) and $^{212}$Po
($T_{1/2}=294.09\pm0.07$ ns) half-life annular variation parameters are
presented. It is shown that two independent sequential sets of the $^{214}$Po
$\tau$-values $(\tau\equiv T_{1/2})$ obtained in the spaced laboratories can be
described by sinusoidal functions. The sinusoid curve with amplitude $A=(5.0
\pm1.5) \cdot 10^{-4}$, period $\omega=(365\pm 8)$ days, and phase $\phi=(170
\pm 7)$ days approximates the set of $^{214}$Po $\tau$ values obtained at BNO
INR RAS during the $\sim$973 days starting on January 4, 2012. The function
approximates a set of $\tau$-values with a time duration of $\sim1460$ days
obtained at the KhNU has an amplitude $A=(4.9\pm1.8)\cdot10^{-4}$, a period
$\omega= (377\pm13)$ days and a phase $\phi=(77\pm10)$ days. The $^{213}$Po
$\tau$-value set with a time duration of $\sim1700$ days can be described by a
sinusoidal function with an amplitude $A=(3.9\pm1.2)\cdot10^{-4}$, a period
$\omega= (370\pm13)$ days and a phase $\phi=(130\pm9)$ days. The $^{212}$Po
$\tau$-value set with a time duration of $\sim670$ days can be described by a
sinusoidal function with an amplitude $A=(7.5\pm1.6)\cdot10^{-4}$, a period
$\omega= (375\pm13)$ days and a phase $\phi=(40\pm10)$ days.
