Ethnomathematics at the Margin of Europe - A Pagan Calendar : Þjóðháttastærðfræði á jaðri Evrópu - Heiðið dagatal

Abstract

In 930, at the close of the settlement period in Iceland, a week-based calendar was adopted. Observations of the solar cycle soon revealed errors of the calendar, which were cleverly amended. In the 12th century, the week-based misseri calendar was adjusted to the Roman calendar used by the Christian Church. It remained in common use for secular purposes until the 19th century, and detailed guides to it were written. Special occasions related to it are still celebrated.