A system configured to calculate the exposure to solar radiation in a given wavelength range, possibly weighted according to a given spectrum of photobiological action, received by a person in each part of the body, possibly including the eyes, comprising a wearable device configured to have stable position and orientation with respect to the body of a person, equipped with sensors capable of detecting the position data of one or more parts of the body according to at least azimuth and inclination with respect to the vertical line depending on the position that the body has during sun exposure, a geolocalization sensor associated to said person, a remote computing unit operatively connected to satellite means configured to receive georeferenced data related to solar irradiation over time and to associate solar irradiance data to the geographic position, the posture and the orientation of the person or of parts of the person's body over time, the remote computing unit being configured to provide the overall incident irradiance and the relative associated dose accumulated over time for each point of the body, according to the posture and orientation relative to the direction of the sun, a portable telecommunication device configured to be positioned close to the person, comprising a first communication interface connected to said wearable device and said geolocalization sensor configured to receive the first data related to the position, posture and orientation of the person or of parts of the person's body, a second communication interface connected to said remote computing unit, the system being configured to send to the unit said first data and to receive second data relative to the person's sun exposure via said second communication interface, said second data comprising said overall incident irradiance and the relative associated dose accumulated over time for each point of the body, means configured to provide said person with information associated to said second data relating to the person's exposure to solar radiation. a wearable device configured to have stable position and orientation with respect to the body of a person, equipped with sensors capable of detecting the position data of one or more parts of the body according to at least azimuth and inclination with respect to the vertical line depending on the position that the body has during sun exposure, a geolocalization sensor associated to said person, a remote computing unit operatively connected to satellite means configured to receive georeferenced data related to solar irradiation over time and to associate solar irradiance data to the geographic position, the posture and the orientation of the person or of parts of the person's body over time, the remote computing unit being configured to provide the overall incident irradiance and the relative associated dose accumulated over time for each point of the body, according to the posture and orientation relative to the direction of the sun, a portable telecommunication device configured to be positioned close to the person, comprising a first communication interface connected to said wearable device and said geolocalization sensor configured to receive the first data related to the position, posture and orientation of the person or of parts of the person's body, a second communication interface connected to said remote computing unit, a first communication interface connected to said wearable device and said geolocalization sensor configured to receive the first data related to the position, posture and orientation of the person or of parts of the person's body, a second communication interface connected to said remote computing unit, the system being configured to send to the unit said first data and to receive second data relative to the person's sun exposure via said second communication interface, said second data comprising said overall incident irradiance and the relative associated dose accumulated over time for each point of the body, means configured to provide said person with information associated to said second data relating to the person's exposure to solar radiation.