When ancient Greeks could not observe any parallax, what were the two bodies they were looking at to determine this? I imagine the stars (or a specific star) would have been one of these, but what was the near body they used?
Normally, when explaining parallax, we tell a person to close an eye, hold a finger up at arms length (the near body) and align this to an object across the room (like the stars in the example above). What "finger" did the Greeks use to try to measure parallax?
They cannot have been measuring the angle between stars as these were believed to be all at the same distance on a hollow sphere.