I've watched about 8 or 9 episodes during my Next Generation marathon and have only just realized something curious indeed. Whenever the Enterprise encounters another vessel, no matter the species or size or type of vessel or if one or both had been cloaked previously, they are always oriented the exact same way as the enterprise. Is this easier for television? Was this something no one considered? Is there some universally agreed upon direction that is up? Some type of automatic system that senses the orientation of other ships and adjusts even when other sensors cannot detect the ship?