The present invention relates to a system and a method for changing the perception of season of an individual. One embodiment of the invention relates to a system for adjusting the seasonal rhythm of an individual comprising one or more radiation units adapted to direct optical radiation at one or more neuroanatomical brain structures of the individual from at least one extra-cranial non-ocular position, and planning means for calculating a dose scheme adapted to be applied to the individual over a plurality of days, said dose scheme comprising at least a morning dose of optical radiation and at least an evening dose of optical radiation, said dose scheme adapted to gradually adjust the length of the day perceived by the individual by incorporating predefined adjustments of the time difference between morning and evening doses.
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