The document discusses several ancient calendars including the Egyptian calendar which had 360 days divided into 12 months of 30 days plus 5 extra days. It also mentions the Jewish, Persian, Julian and Maya calendars. The Maya calendar consisted of three simultaneous timekeeping systems - a 260 day tzolkin, a 365 day haab calendar and a long count calendar. The haab calendar had 18 months of 20 days each plus a 5 day period at the end of the year.

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4. The ancient civil Egyptian calendar had a year that was 360 days
long and was divided into 12 months of 30 days each, plus five
extra days at the end of the year.

6. The Jewish
calendar is a
lunisolar calendar
used today
predominantly for
Jewish religious .
In Israel, it is an
official calendar
for civil purposes
and provides a time
frame for
agriculture.

7. This was introduced
by the emperor
Huang Di
approximately in
2637 b. C.

8. The Persian
calendar or
Iranian calendar
or the modern
Iranian calendar
(Solar Hejri) is
the official
calendar in Iran
and Afghanistan.
It begins on the
vernal equinox.

9. The Julian
calendar began
in 45 BC as a
reform of the
Roman
calendar by
Julius Caesar.

12.  The Maya calendar to consist in 3 different groups
of time, that to elapse simultaneously: tzolkin of
260 days; haab with 365 days and the Long count.

13. Haab’ months: names in glyphs in sequence
Seq. Name of Glyph Seq. Name of Glyph
meaning meaning
Num. month example Num. month example
1 Pop mat 10 Yax green storm
2 Wo' black conjunction 11 Sak' white storm
3 Sip red conjunction 12 Keh red storm
4 Sotz' bat 13 Mak enclosed
5 Sek watering time 14 K'ank'in yellow sun
6 Xul dog 15 Muwan' owl
7 Yaxk'in' new sun 16 Pax planting time
8 Mol water 17 K'ayab turtle
9 Ch'en black storm 18 Kumk'u granary
19 Wayeb' five unlucky days