  The results of measuring diurnal variations of extensive air showers with
energy above 100 TeV detected by the Andyrchi air shower array in 1995-2002 are
presented. It is shown that solar diurnal wave of intensity is formed by
pressure variations and Compton-Getting effect (due to the orbital motion of
the Earth). The data on cosmic ray anisotropy of the Baksan underground
scintillation telescope (BUST) are also presented for energies above 2.5 TeV
covering the period 1982-1998. The diurnal sidereal wave measured by both
Andyrchi and BUST is due to anisotropy of the cosmic rays.
