(3) The computation outside the sphere
The velocity redshift is the same with in the sphere
into formula (12), we have
where Λ0 ，M and a is obtain from the outmost layer.
The total redshift is formula (13).
When Zv=1 , the total redshift is Zmax , and the distance rs corresponding to Zmax is just the limit of sight, that is, the limiting distance of observation.