Actually, this calls for very special consideration when selecting new sector capitals, otherwise you'd have wasted 24 hours. You'd want to make sure its a non-hostile TL7+ world (if possible), and its control radius should ideally cover the maximum number of worlds without overlapping with other SC's control radii.
It should also be bunched up close to 5 other worlds: 2 citadels, 1 foundation, 1 trade hub and 1 jumpbeacon. The jumpbeacon is optional and 1 citadel will also be fine. These will be the "core worlds" of the cluster, and the optimal configuration of the empire would be a hexagonal pattern resembling something like:
_O#O_
O#O#O
_O#O_
Where O represents a cluster and # is the space between them. Of course this is purely idealistic and would depend on the territory available. The old Imperium had a rectangular configuration with clusters stacked on top of each other row-by-row, which wasn't actually optimal because it left a quite few worlds unconnected in the spaces between clusters, but it worked well enough. Perhaps this could be added to the guide...
![Mr. Green :mrgreen:](./images/smilies/icon_mrgreen.gif)