FK5 to FK4
CALL sla_FK524 (R2000, D2000, DR2000, DD2000, P2000, V2000,
R1950, D1950, DR1950, DD1950, P1950, V1950)
R2000  D  J2000.0 $\alpha $ (radians) 
 
D2000  D  J2000.0 $\delta $ (radians) 
 
DR2000  D  J2000.0 proper motion in $\alpha $ (radians per Julian year) 


DD2000  D  J2000.0 proper motion in $\delta $ (radians per Julian year) 


P2000  D  J2000.0 parallax (arcsec) 


V2000  D  J2000 radial velocity (km s${}^{1}$, +ve = moving away) 
R1950  D  B1950.0 $\alpha $ (radians) 
 
D1950  D  B1950.0 $\delta $ (radians) 
 
DR1950  D  B1950.0 proper motion in $\alpha $ (radians per tropical year) 


DD1950  D  B1950.0 proper motion in $\delta $ (radians per tropical year) 


P1950  D  B1950.0 parallax (arcsec) 


V1950  D  radial velocity (km s${}^{1}$, +ve = moving away) 