is located at the center of West Spiral.
It is a naked-eye observatory of celestial events and resembles an armillary sphere; it is made of twenty-four longitudinal and eighteen latitudinal welded curved steel plates.
Its axis is tilted in the North-South plane of an angle of 42d10.375', parallel to the terrestrial axis and corresponding to the geographic latitude of its location.
The intersections between latitudinal and longitudinal plates frame the sky a correspondence is established between each frame and the constellation the frame surrounds.
The observer enters the observatory from a ramp ending the most inner cycle of West Spiral. The rod supporting the ramp is aligned to the Earth axis and pointing toward Polaris, the North Star.
The Observatory follows the tradition of astronomical instruments built at architectural scale, such as those of the Jantar Mantar, an eighteenth century observatory in Jaipur, India.
It serves as a measurement device based on the celestial sphere, determining the passage of time by observation of the orbits of stars and declination of planets.
It links the sky to the local landscape in the perception of remote places and promotes awareness of our presence in time and space.
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