  The rotating reference system, two-point correlation functions, and energy
density are used as the basis for investigating thermal effects observed by a
detector rotating through random classical zero-point radiation. The RS
consists of Frenet -Serret orthogonal tetrads where the rotating detector is at
rest and has a constant acceleration vector. The CFs and the energy density at
the rotating reference system should be periodic with rotation period because
CF and energy density measurements is one of the tools the detector can use to
justify the periodicity of its motion. The CFs have been calculated for both
electromagnetic and massless scalar fields in two cases, with and without
taking this periodicity into consideration. It turned out that only periodic
CFs have some thermal features and particularly the Planck's factor with the
temperature T= h w /k . Regarding to the energy density of both electromagnetic
and massless scalar field it is shown that the detector rotating in the
zero-point radiation observes not only this original zero-point radiation but,
above that, also the radiation which would have been observed by an inertial
detector in the thermal bath with the Plank's spectrum at the temperature T.
This effect is masked by factor 2/3(4 gamma^2-1) for the electromagnetic field
and 2/9 (4 gamma ^2-1) for the massless scalar field, where the Lorentz factor
gamma=(1 - v^2 / c^2)^(1/2). Appearance of these masking factors is connected
with the fact that rotation is defined by two parameters, angular velocity w
and the radius of rotation, in contrast with a uniformly accelerated linear
motion which is defined by only one parameter, acceleration a. Our calculations
involve classical point of view only and to the best of our knowledge these
results have not been reported in quantum theory yet.
