> the distance for light to arrive makes it impossible If you mean the 1 second light travel time is the same as the 1 second clock difference, you can increas

> the distance for light to arrive makes it impossible If you mean the 1 second light travel time is the same as the 1 second clock difference, you can increase the clock difference by just spending longer in orbit. For example, you could wait until the clock difference was 1 hour. Then, if your buddy sent you a light signal at 12 noon by his clock, it would arrive at 1 pm + 1 second (1 second light travel time) by your clock. But it would still be telling you stock exchange rates at 12 noon by your buddy's clock, not 1 pm by your buddy's clock.