North error accumulated on a day of sailing versus time in a day at solstice (A, B, C) and equinox (D) using calcite sunstone.

• Main Authors: Péter Takács (563290), Dénes Száz (3943997), Ádám Pereszlényi (4575124), Gábor Horváth (3944000)
• Format: Still Image
• Language: unknown
• Published: 2022
• Subjects: Cell Biology; Neuroscience; Physiology; Evolutionary Biology; Ecology; Science Policy; Environmental Sciences not elsewhere classified; Astronomical and Space Sciences not elsewhere classified; Biological Sciences not elsewhere classified; Mathematical Sciences not elsewhere classified; Information Systems not elsewhere classified; viking voyages along; following input data; could successfully navigate; computer simulations using; 21 &# 8217; polarimetric viking navigation; navigation steps measured; also randomly changed; following relevant sailing; weakly cloudy skies; sky imaging polarimetry; greenland &# 8217; following intrinsic parameters; navigation periodicity; randomly varying; sailing speed; sailing date; night sailing; diurnal sailing; weak influences; visibility distance; sunstone type; sunny sky; start time; southeast coastline; results show; psychophysical laboratory; planetarium experiments; navigational parameters; foggy conditions; error functions; earlier studies; Greenland
• Online Access: https://doi.org/10.1371/journal.pone.0262762.g007

The black curve on each figure represents the north error averaged for cloudiness as a function of time. Each rectangular column represents a sailing period where the area of the rectangle is the accumulated north error for a measurement cycle. The area under the curve AUC is the averaged north error a simulated Viking route suffers on that day (= sum of the area of rectangles).