  We present simulations of different scanning strategies for the Planck
satellite. We review the properties of slow- and fast-precession strategies in
terms of uniformity of the integration time on the sky, the presence of
low-redundancy areas, the presence of deep fields, the presence of sharp
gradients in the integration time, and the redundancy of the scanning
directions. We also compare the results obtained when co-adding all detectors
of a given frequency channel. The slow-precession strategies allow a good
uniformity of the coverage, while providing two deep fields. On the other hand,
they do not allow a wide spread of the scan-crossing directions, which is a
feature of the fast-precession strategies. However, the latter suffer from many
sharp gradients and low-coverage areas on the sky. On the basis of these
results, the strategy for Planck can be selected to be a slow (e.g. 4
month-period) sinusoidal or cycloidal scanning.
