Once again, glyph 157 could
be pointing at the day which is the first
beyond number 92 + 40 + 24 after March 21.
South of the equator this season is not at
the end of high summer but instead
corresponding to 40 + 24 + 1 = 65 days after
winter solstice, or around day 355 + 65 =
420. This should be February 24 (55) or - if
we should consider the day when Castor rose
heliacally as a leap day - February 23 (54):
... The ordinary year in the
previous Roman calendar consisted of 12
months, for a total of 355 days. In
addition, a 27-day intercalary month, the
Mensis Intercalaris, was sometimes
inserted between February and March. This
intercalary month was formed by inserting 22
days after the first 23 or 24 days of
February ...