In quo finitur Mensi Lunatio detur.
The Reason of this is unfolded by Clavius in
his Calendarium Gregorianum, C. 17. that is to say,
for that it would otherwise happen, that some∣times
the Months would scarce have one or ano∣ther
Day of their proper Lunation through the
whole Year, especially when the first Lunation of
the Year happens upon the first of January; for [ 30]
the other Lunations of the same Year, begin only
in the last Days of the Month.
Fourthly, Observe that the first Month of the
Year amongst the Ancient Egyptians was called
Thot, amongst the Romans, Martius; whence
July was called Quintilis, and August, Sextilis, as
being the fifth and sixth Months from March.
But when Numa added January, and February,
then the usual computation was made from the
first of January. [ 40]
Fifthly, It is also observable, that the Months
were divided by the Romans into three sorts of
Days, Calends, Nones, and Ides. The first Day of
every Month was called Calendae from the Greek
Word 〈 in non-Latin alphabet 〉〈 in non-Latin alphabet 〉, that is, to Call; because on that Day
the People were called as well to the Fairs and
Markets, as to the Capitol, to receive from the
Priests what was to be observed for that Month,
in reference to the Worship of the gods. Next,
followed the Nones, so called, as contracted
from Nundinae, that is, Fairs, as some are of O∣pinion. [ 50]
Lastly came the Eight Days of the Ides,
which follow the Nones; these Ides are generally
supposed to be so called from the old Word
Iduo, which signifies, to Divide; because they
make a division between the Nones, and the
Calends; which Calends, because they have their
fixt and certain Seat in every Month, as falling
upon the first Day of every Month, when as the
Days of the Ides, and the Nones, are various dis∣posed.
There are these following Verses vulgarly [ 60]
made use of to give direction, by what Method
the Nones, or Ides, are ascribed to their respective
Months:
Sex Maius Nonas October, Julius & Mars,
Quatuor, at reliqui dabit Idus quilibet octo.
So that when the Nones are once known, the
finding out of the rest will follow of course.
Sixthly, From these three Days all the rest
take their denomination: For Example, the Day
which precedes the Calends, that is, the last Day
of the fore going Month, is called Pridie Calendas,
or Primus Calendas, Secundus Calendas, the Se∣cond
Day before the Calends, and so of the rest;
and the same is to be said proportionable of the
Nones, and Ides.