In order to compute the fluxes of net radiation and the energy balance of the Venetian Lagoon and its hinterland, it is necessary to know the solar input. To this end, the seasonal variation of the global solar radiation over a 10-year period has been analyzed. The normalized daily transparency coefficients and the atmospheric attenuation coefficients as well as the net radiative fluxes over both the Lagoon and land have been computed and are discussed in terms of the local dynamic climatology. The results are particularly interesting due to their practical applications, including air pollution, emission strategy, thermal pollution of shallow waters, local climatology, preservation of works of art. -- AATA