In the following structure values in the BODY structure, the rotation of the body around its axis is incorrectly described as its day. The length of a day and how long it takes to make one revolution around its axis are not the same, since the rotation around Kerbol needs to be taken into account.

As a suggestion, this can be described as it is in the KSP wiki (taken from the entry on Kerbin):

The Sidereal rotation period is the time it takes to go around its body axis. The solar day is the length of one day on Kerbin. BODY:ROTATIONPERIOD gives the sidereal rotation period not the solar day as it suggests.

BODY:ANGULARVEL and BODY:ROTATIONANGLE both also have this error in distinction between solar day and rotation around its axis.

Although not a big deal on Kerbin since it is a small difference, on different planets such as Moho the difference is quite pronounced.