updated doc with equinox-based frames using IAU 1980 precession nutation model 
updated doc with equinox-based frames using IAU 1980 precession nutation model 

liscju/Orekit,CS-SI/Orekit,wardev/orekit,petrushy/Orekit,attatrol/Orekit,ProjectPersephone/Orekit,CS-SI/Orekit,Yakushima/Orekit,ProjectPersephone/Orekit,liscju/Orekit,treeform/orekit,Yakushima/Orekit,petrushy/Orekit,attatrol/Orekit