Sensitivity and robustness of sky-polarimetric Viking navigation: Sailing success is most sensitive to night sailing, navigation periodicity and sailing date, but robust against weather conditions.

According to Table 1 , in this model the variables sailing date, crystal type, cloudiness dominance m dominance , navigation periodicity Δ t and night sailing are highly significant ( p < 0.05), while the cloudiness changeability σ changeability is not significant.

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