semi minor axis and orbital circumference with the values of aphelion distance and perihelion distance from this article i calculate the semi minor axis to km believe me i used my by me developed equation b sqr aph per aph per but i dont want to explain the equation its hard to write for me in english test and compare it with every other accepted equation for this planet and if you want for any other planet and objekt you will see i'm right with the same equation you can calculate the semi minor axis for article of planets which only give the semi major axis for the orbital circumference i have calculated with numerical integration the very exact value of km test and compare it with the exact values of the semi major axis and semi minor axis on this link or any other exact equation for the circumference of an ellipse you will see i'm right i can't make the changes in this article because i'm only signed up at the german wikipedia but if nobody make this mathematically correct changes in this article maybe i sign up here and make the changes for all planets who gives the aphelion and perihelion distances but only the semi major axis and not the semi minor axis and just a not exactly orbital circumference like in the mercury article lots of greets from austria pygmalion february cet