Lucus sodalibus Fori salutem dicit.
No doubt many of you are familiar with the Roman calendar, which measures its months by counting “backwards” to certain important parts of each month; to be precise, the Romans prior to Julius Caesar used a Lunar calendar, each month of which was divided into three parts based on the phases of the moon: The first phase of the moon, the new moon, is called the kalendae, marking the first of the month. The idus, or the ides, come when the moon is full, and therefore at the middle of the month. Nine days before the ides are the nonae, which mark the half moon.
So the Romans liked to count backwards; that is, rather than count the quantity of days in a month in our modern fashion, the Romans would mark the number of days before the next event (being the kalends, the nones, or the ides of a month). September 1st, for instance, which is hard upon us, would be the kalendae Septembres, the September kalends. By Roman reckoning, today is ante diem quintum kalendas Septembres.
This is where my question lies. By our modern reckoning, we would say that today is the fourth day before the first of September. How does the Latin date (a. d. V kal. Sept.) translate into English? Perhaps: “before the fifth day through the September kalends”? Kalendas Septembres is obviously in the accusative, which has a few potential translations. My bet is that the key to understanding the Roman date is in the correct translation.
My other thought was that the a. d. V, yet being the fourth day before, had something to do with the moon — the moon is seen at night, after all. Also, our modern sense of time defines a day as one full rotation of the Earth, whereas the Romans were more inclined to consider day from sunrise to sunset. Perhaps, since today is the fifth day before the kalends, according to the ancient Romans, the literal meaning is that today is one of five consecutive cycles of the sun in the sky, after which comes the night of September 1st, and with it, in the ancient times, the new moon.
But if that is the case, I am confused about pridie. The last day of the month is called the pridie, and the pridie kal. Sept. is the 31st of August (being Wednesday this year). Does pridie mean “the day before”? If it does, then it doesn’t follow the reasoning that today is ante diem V kal. Sept., for sunrise to sunset on September 1st should be the “day before the September kalends,” no?
The other question I have relates to the naming of the last half of the month, as a whole, the “kalends,” the first part of the month before the day (or night) of the nones the “nones” just as generically, and the time between the nones and the ides the “ides.” I don’t understand this.
Gratias uobis omnibus.
Valetote.