I found Circumference and Rotation Velocity data of Kerbin in Tracking Station. It says that Kerbin has 7.56 AU circumference (so 1.134 e+12 meters), and 21549 m/s rotation velocity.
If I didn't get it wrong, this means that one Kerbin day is 14000+ hours. This can't be right. Was the data wrong? Or maybe I got something wrong?
I'm enjoying on calculating GEO and so on now. So if anyone knows the real data, please correct me. Thank you~