Fig. S1. Schematic overview for the figures S2 to S5 on the following pages.

Fig. S2. (a) Relationship between day length and sun elevation angle. (b) Three calibration methods for the calculation of positions by the threshold method.

Table S1. Summary of the deviation from theoretical day length and solar midnight/noon with mode values and 10 and 90 percentiles.

Appendix S1. Statistics of stationary geolocators and the resulting deviations in latitude and longitude.

Appendix S2. Calibration.

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