Utiliser "sphericity" dans une phrase

1. “If in fact the unique surface texture and crystalline structure are not key to the reflective quality of the stone,” the blue draconian astronomer commented in a throbbing, somewhat sardonic growl, “then the altered piece should not only equal the reflectivity of the unaltered piece, but significantly surpass it, for not only is the sphericity of its shape now perfect, which will allow the many pieces to focus together on a single point, it’s surface texture is now perfectly smooth, which should vastly reduce scattering of the reflection

2. The disparity of temperature between the poles and the equator arises from the sphericity of earth