 Complete the following phrase:  The smaller dome above the altar is decorated with astrological depictions of star constellations. The arrangement of the constellations is accurate enough to estimate the particular date they represent, although there has been disagreement on the intended date represented there. In 1911, Aby Warburg first made an attempt with the help of a Hamburg astronomer and concluded that the date was the July 9, 1422, the date of the consecration of the altar. Gertrud Bing later rejected this in favor of a calculation by Arthur Beer for July 6, 1439, the date of the closing session of the 