0 is 0.000000 the origin, the Sun.
A is 0.792893…, perihelion Mercury, 2 minus .5 (sqrt 2 + 1)
B is 1.000000…, mean orbital dist. Mercury, .5 (sqrt 1 + 1)
C is 1.207106…, aphelion Mercury, .5 (sqrt 2 + 1)
D is 1.414213…, square root 2. (sqrt diameter Mercury)
