Right. And when it come to computing real power, rather than nobility of lineage, the key issues are (1) industrial worlds, as we’ve already gone into, and (2) distance.
A Sector is 200 light-years by 200; a Quadrant, 100 by 100 ly; a District, 20 x 20 ly (according to Chris’s notes on astrocartography). The speed of ships is measured in DV (distortis vicis, “distortion week”), where 1 DV is two light years per week. Chris posted in an earlier thread that
although there are some super-fast couriers with “Burnhardt Compression Drives” (BCD) that can go as fast as 18 DV.
Now, when you’re talking about maintaining control of a region of space, the key thing to calculate is an asymmetrical round trip: how long it takes for a courier to bring a report from a trouble spot on your frontier to your capital, and how long it takes for a combat force to deploy from your capital to the frontier trouble. (Of course, you can position combat squadron nearer your frontier, but their commanders might decide to rebel if you can’t bring your personal fleet to bear from the capital).
Let’s be generous and allow couriers to sustain 12.5 DV, or 25 light years per week. That’s assuming BCD is fairly common and you have a system of prepositioned refueling stops and/or a relay of couriers that goes all the way from the frontier to the capital; not all interstellar realms will have this! Let’s further assume that prepositioned depots to cut refueling time allows combat squadrons optimized for fast response to sustain an impressive average of 5 DV, or 10 light-years a week.
So, response time for various distances:
Across a Sector (200 ly wide):
Courier inbound: 8 weeks
Combat outbound: 20 weeks
Total response time: 28 weeks
Across a Quadrant (100 ly wide), i.e., from the middle of a Sector to the edge:
Courier inbound: 4 weeks
Combat outbound: 10 weeks
Total response time: 14 weeks
Across a District (20 ly wide):
Courier inbound: < 1 week
Combat outbound: 2 weeks
Total response time: < 3 weeks