  The trajectories of the clusters $\eta$ Cha, $\epsilon$ Cha and Cha I, Cha
II, constructed backward in time, have been studied. We concluded that the
hypothesis about the joint formation of all four of these clusters from one
molecular cloud cannot be completely excluded. However, 10-15 Myr ago, all
these four clusters were located at approximately the same height above the
plane of the Galaxy. Thus, the gas-dust clouds from which all these four
clusters were formed were located on one broad front. It is possible that the
appearance of the Cha I, Cha II, $\epsilon$ Cha and $\eta$ Cha clusters may be
associated with the impact on such a front of shock waves formed after
supernova explosions in the Scorpius-Centauri association. New estimates of the
kinematic ages of the clusters Cha I and Cha II are obtained as $0.12\pm0.19$
and $0.05\pm0.15$, respectively. It is shown that the minimum size of the Cha
I-north and Cha I-south clusters corresponded to the time of $0.55\pm0.24$ Myr
and $0.04\pm0.18$ Myr ago, respectively, and approximately 1.5 Myr ago the
distance between the trajectories of these two groupings was minimal.
