the obelisk need to cover quite a large potion of the map, over 70% i think. as for the sattelites i cant remember what to do, most likely because it wasnt too dramatic
As I remember it you need only 60%, but you can build satellites in the territory of your allies. I never tried this, but there is also an enabling advance for the satellites.
-Martin
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Civ2 military advisor: "No complaints, Sir!"