The harmonization method according to the invention comprises: a step of obtaining (E20, E60), from measured inertial information (E10, E50) by a measuring device on board by the angular positioner, during at least one predetermined operating period (T1, T2) of data representative of a local gravity intensity seen by the measuring device and / or of an earth rotation speed, the angular positioner being held fixed during said at least one period of functioning; a step of evaluating (E30, E70) at least one angular bias affecting the positioner reference frame from the data obtained; and a step of harmonization (E40, E80) of the positioner reference with respect to the terrestrial reference by compensating for said at least one angular bias thus evaluated.
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