| The orbits of 10,000 halos within 100 Mpc are followed from z=4 to today and then to twice the current age. Cosmicflows-3 galaxy distance measures provide constraints. Reasonable models require reasonably well-defined masses for the halos. Good fits require inter-halo mass components to complement the halo components. Models ranging from H 0 =69 with outflow to H 0 =77 with infall are examined. With our preferred model with H 0 =73, the local mean density of matter equals the cosmic mean, and the mass within halos greater than 10 12 suns and inter-halo mass are about equal. The nonlinear orbit reconstructions are particularly relevant in the high density regions of the Great Attractor, along the Perseus-Pisces chain of clusters, and in the vicinity of the Virgo Cluster. The core of the Great Attractor is revealed with greater clarity than ever previously. |