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The observation of  blank fields , regions of the sky devoid of stars down to a given threshold magnitude, constitutes one of the typical important calibration procedures required for the proper reduction of astronomical data obtained in imaging mode. This work describes a method, based on the use of the Delaunay triangulation on the surface of a sphere, that allows for easy generation of blank‐field catalogues. In addition to that, a new tool named  tesela , accessible through the Internet, has been created to facilitate the user to retrieve, and visualize using the Virtual Observatory tool  aladin , the blank fields available near a given position in the sky.

tesela : a new Virtual Observatory tool to determine blank fields for astronomical observations