On 29 Jul, Jack Lewis <jandj.lewis@xxxxxxxxxxxxx> wrote: > Dear Alan, > I hope that you are still on-line to the forum. Please could > you point me in the right direction to find out how the distance to the > Sun was measured? Perhaps your brother could be helpful here? > Jack Lewis He's not in the dome at the moment, but he will be later. I'll ask him, but I would guess it's parallax when the earth is at opposite ends of its orbit, and knowing the diameter of the orbit. Alan Griffin