the Armenian chronicle) make reference relatively explicitly to conjunctions between the moon and stars, of which one is identified (Jupiter, in the Armenian chronicle). The three other documents are very unclear. In 1999, George W. Collins and his colleagues defended the plausibility of European sighting of SN 1054. They argue that the records suggest that European sightings even predate Chinese and Japanese reports by more than two months (April 1054). These authors emphasize the problems associated with the Chinese reports, especially the position of the supernova relative to Zeta Tauri. They also adduce a Khitan document which they suggest might establish observation of the supernova at the time of the solar eclipse of 10 May 1054 (which would corrobate the "late" date of Chinese observation of the event). Conversely, they interpret the European documents, taken in conjunction, as plausibly establishing that an unusual astronomical phenomenon was visible in Europe in the spring of 1054, i.e. even before the Sun's conjunction with Zeta Tauri. They also surmise that the correct year in the report by Ibn Butlan is AH 445 (23 April 1053 – 11 April 1054) rather than AH 446 (12 April 1054 – 1 April 1055). The publication by Collins et al. was criticized by Stephenson and Green (2003). These authors insist that the problems with the Chinese and Japanese documents can easily be resolved philologically (as common copyists' mistakes) and need not indicate unreliability of the Chinese observations. Stephenson and Green condemn attempts at uncovering European sightings of the supernova as it were at any cost as suffering from confirmation bias, "anxious to ensure that this event was recorded by Europeans". They also reject the idea of the Khitan document referring to the supernova as a mistake based in a translation of the document. The Cronaca Rampona The European account of a supernova sighting that is considered the most plausible is part of a medieval chronicle from the region of Bologna, the Cronaca Rampona. This text came to astronomers' attention in 1972, and was interpreted as a possible sighting of the supernova in 1981, and again in 1999. The relevant part of the chronicle translates to: Before even looking for potential problems in the astronomical last sentence of the passage, skeptics point out at least two discrepancies in the dating: Pope Stephen IX became Pope in 1057, not 1058, and Emperor Henry III, Holy Roman Emperor was born