2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/13216This paper discusses the problem of the optimisation of the scanning strategy for the Planck mission.7 pages TEX, 1 eps figure, invited talk at the workshop "The Cosmic Microwave Background and the Planck Mission", Santander, June 22-26thAstrophysicstext