 These months were attested by Bede in his works "On Chronology" and "The Reckoning of Time" written in the 8th century.His months are probably those as written in the Northumbrian dialect of Old English which he was familiar with.The months were so named after the moon; the new moon marking the end of an old month and start of a new month; the full moon occurring in the middle of the month, after which the month was named.