 This was the time the 365-day solar and the 260-day sacred calendars ended on the same day and the Aztec celebrated the Binding of the Years with the New Fire Ceremony.In order to perform the ritual, priests marched in solemn procession up the Hill of the Star on a peninsula near "Culhuacán" to wait for the star "Yohualtecuhtli" (either Aldebaran in the Taurus constellation or the Pleiades as a whole) to get past its zenith.Having ascertained this, they would tear out the heart of a sacrificial victim and kindle a flame in a small wooden hearth they placed inside the hole left in his chest.