Javier Martín Artajo and Jacinto del Buey Pérez have formed a magnificent tandem, contributing their computer knowledge and their skills as a photographer, their patience and tenacity to methodically inventory almost all of the solar quadrants found in this province. The appearance and description of a significant number of Mass clocks that mark canonical hours is surprising. They are engraved on the south face of the churches and their purpose was to complete the liturgical acts. Fruit of the survey facilitated by the Exma. Provincial Council; the authors have been able to develop in collaboration with the Center for Photography and Historical Image of Guadalajara this exhibition consisting of 18 paintings of 40 x 50 cm. with their corresponding photos of Clocks and eight explanatory panels that complete it.