The Buddhist calendar is luni-solar,
a combination of the lunar and solar calendars. It is based on the
original third century Surya Siddhanta. The months in this calendar
alternate between 29 and 30 and at regular intervals, an intercalated
day and a 30-day month added to it. The people living in the Southeast
Asian countries mainly use the Buddhist calendar. These countries
include Cambodia, Laos, Thailand, and Myanmar (formerly Burma). There
are mainly four versions of the Calendar of the Buddhists.
The lunisolar intercalation system of the calendar has seven extra
months (adhikamasa), every 19 years and 11 extra days (adhikavara),
every 57 years. On an average, a year consists of 365.25875 days, deemed
from the mahayuga of 4,320,000 years. While the Hindu version makes
additions and deduction the moment the astronomical formulae require,
the Southeast Asian one delays it. Then, we have the Thai/Lao/Cambodian
version in which there cannot be an extra day in the year having an
extra month.
The Burmese version is exactly the opposite. It permits an extra day
only in the years having an extra month. Thus, each of the four versions
of the calendar has different days, i.e. 354, 355, 384, or 385 days
respectively. The names of the month are in Sanskrit, namely Chaitra,
Vaisakha, Jyestha, Ashadha, Shravan, Bhadrapada, Asvina, Kartik,
Maragasirsha, Pausha, Magha and Phalguna. The old Burmese month names
were Tagu, Kason, Nayon, Wazo, Wagaung, Tawthalin, Thadingyut,
Tarzaungmon, Natdaw, Pyatho, Tabodwe and Tabaung. There were/are mainly
four eras in the Buddhist calendars, namely…
