Calendar for the single year of 1758. The calendar is made from a disc of bronze with a dark and shiny finish. On one side of the calendar is a table with the months in three letter abbreviations and a table with the numbers for the number of days. Around the edge of the table are inscriptions with term dates and information about Easter. The other side has a table relating to phases of the moon for each month. Around the table are dates including a term date, Easter and Ash Wednesday.