Page "Gaussian gravitational constant" Paragraph 3

In Theoria Motus, Gauss gave an expression for all bodies orbiting the Sun that had a constant value.

To derive this expression we need the specific relative angular momentum, h, which is related to the areal velocity and a constant of the motion of a planet and the formulae for free orbits.

We note that h is equal to the area, ΔA, swept out by the radius divided by the time, Δt, and also related to the parameter, p