The “astronomy building” aims to optimize the sunlight: catching it when it is beneficial and shading it when it is harmful. The planning is based on astronomy measurements specifically made in the area. The measurement identifies the angles of the sun on the days of equinoxes (21^st March and 21^st September) so that the sunlight is used at its best. The part of the building that is in the shade is made of walls with limited openings, the part of the building in the sun has a horizontal system of shielded windows. This lets the light in only with a defined angle of sunlight in the cold period (21^st September / 21^st March) and in the warm period (21^st March / 21^st September) but only at the beginning and at the end of the day.