  Six archival Chandra observations are matched with eight sets of radio data
and studied in the context of the outflow method to measure and study the spin
properties of $\rm{Sgr ~A^*}$. Three radio and X-ray data sets obtained
simultaneously, or partially simultaneously, are identified as preferred for
the purpose of measuring the spin properties of $\rm{Sgr ~A^*}$. Similar
results are obtained with other data sets. Results obtained with the preferred
data sets are combined and indicate a weighted mean value of the spin function
of $\rm{F} = 0.62 \pm 0.10$ and dimensionless spin angular momentum of
$\rm{a_*} = 0.90 \pm 0.06$. The spin function translates into measurements of
the black hole rotational mass, $\rm{M_{rot}}$, irreducible mass,
$\rm{M_{irr}}$, and spin mass-energy available for extraction, $\rm{M_{spin}}$,
relative to the total black hole dynamical mass, $\rm{M_{dyn}}$. Weighted mean
values of $\rm{(M_{rot}/M_{dyn}) = (0.53 \pm 0.06)}$, $\rm{({M_{irr}/M_{dyn})}
= (0.85 \pm 0.04)}$, $\rm{({M_{spin}/M_{dyn})} = (0.15 \pm 0.04)}$,
$\rm{{M_{rot}} = (2.2 \pm 0.3) \times 10^6 ~M_{\odot}}$, $\rm{{M_{irr}} = (3.5
\pm 0.2) \times 10^6 ~M_{\odot}}$, and $\rm{{M_{spin}} = (6.2 \pm 1.6) \times
10^5 ~M_{\odot}}$ are obtained; of course $\rm{{(M_{rot}/M_{irr})} = (0.62 \pm
0.10)}$ since $\rm{{(M_{rot}/M_{irr})} = F}$. Values obtained for $\rm{Sgr
~A^*}$ are compared with those obtained for M87 based on the published spin
function which indicate that M87 carries substantially more rotational energy
and spin mass-energy relative to the total (i.e., dynamical) black hole mass,
the irreducible black hole mass, and in absolute terms.
