Jeremiah Horrocks had attempted to produce an estimate based on his observation of the 1639 transit (published in 1662), giving a solar parallax of , similar to Wendelin's figure. The solar parallax is related to the Earth–Sun distance as measured in Earth radii by
Jeremiah Horrocks attempted to estimate a value based on his observation of the 1639 transit, which was published in 1662. His calculation produced a solar parallax value similar to Wendelin's findings. The relationship between the solar parallax and the Earth–Sun distance is expressed in terms of Earth radii.