Gives a lunar calendar given year, month, day

This is a Python adaptation program from a HTML/javascript page (source:http://www.informatik.uni-leipzig.de/~duc/amlich)

The lunar yera may contains 12 or 13 months.

The leap month is a month (between 2 new moons) that does not contains a principal solar major term.

Solar terms 24 positions of the sun on the ecliptic every 15°. Major terms are positions muliple of 30° (Dong Chi, Dai Han, Vu Thuy, ..).

Dong Chi, Xuan Phan, Ha Chi, Thu Plan match respectively with Winter solstice, Spring equinox, Summer solstice, Autumn equinox.

The program will gives the location of the 13th month (called leap month) with respect to the solar calendar.

Two classes : Tk_data, LunarDate

Tk_data gives the code for the year from TK tables defined in amlich_data.py

• Class variables : regularMonths, allMonths (leap month lenght is negative), offsetOfTet (lunar new year day offset from 1st January), leapMonth, leapMonthLenght

• Class methods : private allMonth()

use : tk = Tk_data(year)

1. tk data : 25 bits

   8 bits = day offset lunar new year day wrt solar new year day

   1 bit = leapmonthlenght (0=29, 1, 30)

   12 bits = regularMonthsLenght (0=29, 1=30)

   4 bits = leapMonth number

2. LunarDate : (dd, mm, yy, leap, jd)

   getYearInfo(yy) will give a list of LunarDate for each lunar month of yy

   A quick way to know if a year has a leap month : year%19 (% = rest of division) must be 90,3,6,9,11,14,17)

A leap month is a month that not include a major solar term. Here the lunar month after lunar month 6 6 has no major term because the major term Xử thử is part of the next lunar mont as it happens the same day as the next new moon on 23/08.