Module calendrica-old-hindu
Old Hindu solar and lunar calendar conversions.
Ported from "Calendrical Calculations" (4th edition) by Nachum Dershowitz and Edward M. Reingold. Original Lisp code (CALENDRICA 4.0) is Apache 2.0 licensed.
Functions
| hindu_solar_date (year, month, day) | Construct a Hindu solar date {year, month, day}. |
| old_hindu_solar_from_fixed (date) | Old Hindu solar date {year, month, day} equivalent to fixed `date`. |
| fixed_from_old_hindu_solar (s_date) | Fixed date corresponding to Old Hindu solar date `s_date`. |
| old_hindu_lunar_from_fixed (date) | Old Hindu lunar date {year, month, leap, day} equivalent to fixed `date`. |
| fixed_from_old_hindu_lunar (l_date) | Fixed date corresponding to Old Hindu lunar date `l_date`. |
| old_hindu_lunar_leap_year (l_year) | True if Old Hindu lunar year `l_year` is a leap year. |
| jovian_year (date) | Year in Jupiter's 60-year cycle for fixed `date`. |
Functions
- hindu_solar_date (year, month, day)
-
Construct a Hindu solar date {year, month, day}.
Parameters:
- year number Hindu solar year.
- month number Hindu solar month.
- day number Hindu solar day.
Returns:
-
table
{year, month, day}
- old_hindu_solar_from_fixed (date)
-
Old Hindu solar date {year, month, day} equivalent to fixed `date`.
Parameters:
- date number Fixed date.
Returns:
-
table
{year, month, day}
- fixed_from_old_hindu_solar (s_date)
-
Fixed date corresponding to Old Hindu solar date `s_date`.
Parameters:
- s_date table Hindu solar date {year, month, day}.
Returns:
-
number
Fixed date.
- old_hindu_lunar_from_fixed (date)
-
Old Hindu lunar date {year, month, leap, day} equivalent to fixed `date`.
Parameters:
- date number Fixed date.
Returns:
-
table
{year, month, leap, day}
- fixed_from_old_hindu_lunar (l_date)
-
Fixed date corresponding to Old Hindu lunar date `l_date`.
Parameters:
- l_date table Old Hindu lunar date {year, month, leap, day}.
Returns:
-
number
Fixed date.
- old_hindu_lunar_leap_year (l_year)
-
True if Old Hindu lunar year `l_year` is a leap year.
Parameters:
- l_year number Old Hindu lunar year.
Returns:
-
boolean
- jovian_year (date)
-
Year in Jupiter's 60-year cycle for fixed `date`.
Parameters:
- date number Fixed date.
Returns:
-
number
Year (1..60).