  Surface temperature inhomogeneities in classical T Tauri stars (CTTS) induced
by magnetic activity and mass accretion lead to rotational modulation of both
photometric and spectroscopic parameters of these stars. Using the extended
photometric catalogue by Grankin et al. (2007), we have derived the periods and
amplitudes of the rotational modulation of brightness and color for 31 CTTS;
for six of them, the periods have been revealed for the first time. The
inclinations of the rotation axis and equatorial rotational velocities of CTTS
have been determined. We show that the known periods of brightness variations
for some of the CTTS are not the axial rotation periods but are the Keplerian
periods near the inner boundary of the dusty disk. We have found that the
angular velocity of CTTS with a mass of 0.3 - 3 M_sun in the Taurus-Auriga
complex remains constant in the age range 1 - 10 Myr. CTTS on radiative
evolutionary tracks rotate faster than completely convective CTTS. The specific
angular momentum of CTTS depends on the absolute luminosity in the H\alpha-
line.
