Roman calendar

calendar introduced by Julius Caesar in 45 BC

year-numbering system

calendar

The Ides of March is the day on the Roman calendar marked as the Idus, roughly the midpoint of a month, of Martius, corresponding to 15 March on the Gregorian calendar. It was marked by several major religious observances. In 44 BC, it became notorious as the date of the assassination of Julius Caesar, which made the Ides of March a turning point in Roman history.

hottest part of summer in the Northern Hemisphere

The calends or kalends () is the first day of every month in the Roman calendar. The English word "calendar" is derived from this word.

Latin poem by Ovid (8 AD)

In ancient Rome, the fasti (Latin plural) were chronological or calendar-based lists, or other diachronic records or plans of official and religiously sanctioned events. After Rome's decline, the word fasti continued to be used for similar records in Christian Europe and later Western culture.

thumb|300px|Detail of Menologium, showing saints and martyrs of December, January and February, painted by John Tokhabi, 11th century [[tetraptych, kept at the Saint Catherine's Monastery.]] A menologium (, pl. menologia), also known by other names, is any collection of information arranged according to the days of a month, usually a set of such collections for all the months of the year. In particular, it is used for ancient Roman farmers' almanacs (); for the untitled Old English poem on the Julian calendar that appears in a manuscript of the Anglo-Saxon Chronicle; for the liturgical books (

inscription

thumb|A fragment of the Fasti Praenestini for the month of [[Aprilis, showing its nundinal letters on the left side]] thumb|The full remains of the Fasti Praenestini

part of the Fasti capitolini, recording the Triumphs celebrated by Roman generals

fragmentary calendar or fasti from Ostia

shiv the man

Pre-Julian Roman calendar

religious station used for the ritual observation of the new moon in ancient Rome

historical calendar of religious observances

Ancient Roman inscriptions guiding farming in each month