[net.followup] Gregorian Cycle

eric@sri-unix (10/26/82)

The following information is taken from the Encyclopedia Brinttanica,
(c) 1958:

The Roman Republic calendar consisted of twelve lunar months,
Martius, Aprilis, Maius, Iunius, Quintilis, Sextilis, September,
October, November, December, Ianuarius, Februarius. 
Of these, Martius, Maius, Quintilis and October had each 31 days,
the rest 29, save Februarius, which had 28. A good tradition,
unjustly suspected in ancient and modern times, declares that
Ianuarius and Februarius were additions to an original year of 10
months. Such a year of course was discontinuous; between year and
year there was a gap of some 60 days, a phenomenon quite well
authenticated among savage and barbarous people. February was
popularly thought to end, however, on the 23rd, the Terminalia,
and it was after this date that intercalation was made, which took
place once or twice in four years. In 153 B.C. Jan. 1 ousted Mar. 1
as the official New Year's day.

Julius Caesar abolished the use of the lunar year and the intercalary
month, and regulated the civil year entirely by the sun. He fixed the
mean length of the year at 365 1/4 days, and decreed that every fourth
year should have 366 days, the other years having each 365. For many
years it was imagined that Caesar readjusted the year so that the
months January, March, May, July, September and November should have
each thirty-one days, and the other months thirty, excepting 
February, which in common years should have only twenty-nine, but
every fourth year thirty days. But no ancient or modern authority
supports this view. Most modern authorities are agreed that much of
the suggestion about Augustan activities is unwarranted and that
Augustus had nothing to do with the lengthening of the month bearing
his name.