Halidai's Kalendarium

medieval calendar page February
KB MS.Thott 143 2°
Royal Library of Denmark

How to Use This Calendar

The form of this calendar is typical of those commonly used throughout the middle ages (see linked image above). Each page has seven columns: the sixth lists any religious holy days, and the seventh is for occasional astronomical notes.

Column 1 - Day of the Month
This is the day of the month according to the modern calendar. It is included for ease of modern use, and wouldn't have been noted in this manner on medieval calendars.

Column 2 - Lunar Cycle
Where the new moon occurs in the month is indicated by a roman numeral representing the year's place in the 19 year Metonic cycle - this number was sometimes referred to as the Golden Number. For the purposes of using this calendar, the Golden Number for 2010 is 18, and whichever days are marked with "xviii" are days of a new moon. Note that this method is not very precise, so the proper date of the new moon may be off by a day.

Column 3 - Weekday
The day of the week is indicated by the Dominical Letter. For the purposes of using this calendar the Dominical Letter for 2010 is C, and whichever days are marked with a C are Sundays.

Columns 4 & 5 - Day of the Month
This shows the day of the month using the Roman calendar (e.g. "4 Ides" being the fourth day before Ides).

Column 6 - Holidays
The feasts/holy days listed were taken from the calendar in the Copenhagen Psalter (KB MS.Thott 143 2°) which was created in England around 1170. Feasts of lesser importance are written in black, but those of greater importance are marked in red, blue, or green.

Where possible, the text on the saints and other feasts listed was taken from the Golden Legend, compiled by Jacobus de Voragine in 1275, and translated and published by William Caxton in 1483.

Column 7 - Notes
The calendar in the Copenhagen Psalter contains occasional notes here, generally of an astronomical or astrological nature.

Because the texts of the calendar are often colored, links to pages with further information on a subject are marked with a § symbol.