Nevermind, I figured it out. I copied the spacecenter tag from after kerbin, and modified it. It looks like this now:
SpaceCenter
{
latitude = 0
longitude = 28
lodvisibleRangeMult = 6
repositionRadiusOffset = 2978
reorientFinalAngle = 101
decalLatitude = 0
decalLongitude = 28
heightMapDeformity = 0
absoluteOffset = 3000
absolute = true
radius = 4200
angle = 180
groundColor = 0.2, 0.2, 0.2, 0.69
}