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We use the method of statistical parallax to constrain the distance-scalezero points and analyze the kinematics of extensive samples of Galacticclassical Cepheids, RR Lyrae type variables, and blue horizontal branch stars,which serve as standard candles/kinematic tracers of various Galacticpopulations. We obtain three consistent estimates for the local circularvelocity based on the mean velocities of halo RR Lyrae variables, BHB stars,and Galactic rotation curve inferred from Cepheid data with an average value of210+/-6 km/s, which is close to the average circular velocity in the 5-40 kpcinterval of Galactocentric distances inferred from BHB star data (195+/-5km/s), thereby providing further supporting evidence for the practically flatshape of the Galactic rotation curve beyond ~5 kpc from the center. Theinferred distance-scale corrections imply a solar Galactocentric distance of7.7+/-0.4 kpc, an LMC distance modulus of 18.42+/-0.06, and a Hubble constantof 73-85 km/s/Mpc.

Estimating the Kinematic Parameters and the Distance-Scale Zero Point  for the Thin-Disk, Thick-Disk, and Halo Population Tracers via 3D Velocity  Data