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 = 56 671 637,01 km (believe me - i used my (by me) developed equation  b = sqr ( ((aph + per) / 2)² + ((aph - per) / 2)²) , 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  359 976 796,63 km - test and compare it with the exact values of the semi-major-axis and semi-minor-axis, on this link  http://www.mathematik.ch/anwendungenmath/numint/  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, Pygmalion1 (24. February 2007 , 12:03 (CET))