2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/9656In the rest of this volume Lahav and Fisher have presented the method of Spherical Harmonic Analysis (SHA) and its use in estimating cosmologically interesting parameters. Here I demonstrate the use of SHA in cross-correlating galazy catalogues and present an estimate of the ratio of the optical and IRAS galaxy bias parameters; b_O/b_I ~ 1.7.Paris Conference 2 pages uuencoded postscript file- figure available upon requestAstrophysicstext