  We study features of the 3D anisotropy of galactic cosmic rays (GCR) for
1965-2014. We analyze the 27-day variations of the 2D GCR anisotropy in the
ecliptic plane, and the north-south anisotropy normal to the ecliptic plane. We
study the dependence of the 27-day variation of the 3D GCR anisotropy on the
solar cycle and solar magnetic cycle. We demonstrate that the 27-day variations
of the GCR intensity and anisotropy can be used as an important tool to study
solar wind, solar activity and heliosphere. We use the components of the 3D GCR
anisotropy found based on hourly data of neutron monitors (NMs) and muon
telescopes (MTs) using the harmonic analyses and spectrographic methods. We
correct 2D diurnal variation of the GCR intensity for the influence of the
Earth magnetic field. We derive the north-south component of the GCR anisotropy
based on the GG index calculated as the difference in GCR intensities of Nagoya
multidirectional MTs. We show that behavior of the 27-variation of the 3D
anisotropy verifies an existence of a stable long-lived active heliolongitudes
on the sun. This finding illustrates usefulness of the 27-day variation of the
GCR anisotropy as a unique proxy to study solar wind, solar activity and
heliosphere. We distinguish a tendency of the 22-year changes of the amplitudes
of the 27-day variation of the 2D anisotropy connected with the solar magnetic
cycle. We demonstrate that the amplitudes of the 27-day variation of the
north-south component of the anisotropy vary upon the 11 year solar cycle,
however, a dependence of the solar magnetic polarity hardly can be recognized.
We show that the 27-day recurrences of the $GG$ index and At component are in a
high positive correlation, and both are highly correlated with By component of
the heliospheric magnetic field.
