def new_year(cls, gregorian_year):
"""Return fixed date of Observational (classical)
Nisan 1 occurring in Gregorian year, 'gregorian_year'."""
jan1 = GregorianDate.new_year(gregorian_year)
equinox = Solar.solar_longitude_after(Astro.SPRING, jan1)
sset = JAFFA.universal_from_standard(JAFFA.sunset(ifloor(equinox)))
return cls.phasis_on_or_after(ifloor(equinox) - (14 if (equinox < sset) else 13), JAFFA)
def hindu_lunar_holiday(l_month, l_day, gregorian_year):
"""Return the list of fixed dates of occurrences of Hindu lunar
month, month, day, day, in Gregorian year, 'gregorian_year'."""
l_year = HinduLunarDate.from_fixed(GregorianDate.new_year(gregorian_year)).year
date1 = hindu_date_occur(l_month, l_day, l_year)
date2 = hindu_date_occur(l_month, l_day, l_year + 1)
return list_range([date1, date2], GregorianDate.year_range(gregorian_year))
def hindu_lunar_event(l_month, tithi, tee, gregorian_year):
"""Return the list of fixed dates of occurrences of Hindu lunar tithi
prior to sundial time, tee, in Hindu lunar month, l_month,
in Gregorian year, 'gregorian_year'."""
l_year = HinduLunarDate.from_fixed(GregorianDate.new_year(gregorian_year)).year
date1 = hindu_tithi_occur(l_month, tithi, tee, l_year)
date2 = hindu_tithi_occur(l_month, tithi, tee, l_year + 1)
return list_range([date1, date2], GregorianDate.year_range(gregorian_year))
def in_gregorian(cls, c_month, c_day, g_year):
"""Return the list of the fixed dates of Coptic month 'c_month',
day 'c_day' that occur in Gregorian year 'g_year'."""
jan1 = GregorianDate.new_year(g_year)
y = cls.from_fixed(jan1).year
date1 = CopticDate(y, c_month, c_day).to_fixed()
date2 = CopticDate(y + 1, c_month, c_day).to_fixed()
return list_range([date1, date2], GregorianDate.year_range(g_year))
def vietnamese_location(tee):
"""Return the location for Vietnamese calendar is Hanoi;
varies with moment, tee. Time zone has changed over the years."""
if (tee < GregorianDate.new_year(1968)):
z = 8
else:
z =7
return Location(angle(21, 2, 0), angle(105, 51, 0), 12, Clock.days_from_hours(z))
def yahrzeit_in_gregorian(self, gregorian_year):
"""Return the list of the fixed dates of death date death_date (yahrzeit)
that occur in Gregorian year 'gregorian_year'."""
jan1 = GregorianDate.new_year(gregorian_year)
y = HebrewDate.from_fixed(jan1).year
date1 = self.yahrzeit(y)
date2 = self.yahrzeit(y + 1)
return list_range([date1, date2], GregorianDate.year_range(gregorian_year))
def birthday_in_gregorian(self, gregorian_year):
"""Return the list of the fixed dates of Hebrew birthday
birthday that occur in Gregorian 'gregorian_year'."""
jan1 = GregorianDate.new_year(gregorian_year)
y = HebrewDate.from_fixed(jan1).year
date1 = self.birthday(y)
date2 = self.birthday(y + 1)
return list_range([date1, date2], GregorianDate.year_range(gregorian_year))
def julian_in_gregorian(j_month, j_day, g_year):
"""Return the list of the fixed dates of Julian month 'j_month', day
'j_day' that occur in Gregorian year 'g_year'."""
jan1 = GregorianDate.new_year(g_year)
y = JulianDate.from_fixed(jan1).year
y_prime = 1 if (y == -1) else (y + 1)
date1 = JulianDate(y, j_month, j_day).to_fixed()
date2 = JulianDate(y_prime, j_month, j_day).to_fixed()
return list_range([date1, date2], GregorianDate.year_range(g_year))
def in_gregorian(cls, month, day, gregorian_year):
"""Return list of the fixed dates of Islamic month 'month', day 'day' that
occur in Gregorian year 'gregorian_year'."""
jan1 = GregorianDate.new_year(gregorian_year)
y = cls.from_fixed(jan1).year
date1 = IslamicDate(y, month, day).to_fixed()
date2 = IslamicDate(y + 1, month, day).to_fixed()
date3 = IslamicDate(y + 2, month, day).to_fixed()
return list_range([date1, date2, date3], GregorianDate.year_range(gregorian_year))
def hindu_lunar_new_year(g_year):
"""Return the fixed date of Hindu lunisolar new year in
Gregorian year, g_year."""
jan1 = GregorianDate.new_year(g_year)
mina = hindu_solar_longitude_at_or_after(330, jan1)
new_moon = HinduLunarDate.day_at_or_after(1, mina)
h_day = ifloor(new_moon)
critical = HinduDate.sunrise(h_day)
return (h_day +
(0 if ((new_moon < critical) or
(HinduLunarDate.day_from_moment(HinduDate.sunrise(h_day + 1)) == 2))
else 1))
def tzom_tevet(cls, gregorian_year):
"""Return the list of fixed dates for Tzom Tevet (Tevet 10) that
occur in Gregorian year 'gregorian_year'. It can occur 0, 1 or 2 times per
Gregorian year."""
jan1 = GregorianDate.new_year(gregorian_year)
y = HebrewDate.from_fixed(jan1).year
d1 = HebrewDate(y, HebrewMonth.TEVET, 10).to_fixed()
d1 = d1 + 1 if DayOfWeek.from_fixed(d1) == DayOfWeek.Saturday else d1
d2 = HebrewDate(y + 1, HebrewMonth.TEVET, 10).to_fixed()
d2 = d2 + 1 if DayOfWeek.from_fixed(d2) == DayOfWeek.Saturday else d2
dates = [d1, d2]
return list_range(dates, GregorianDate.year_range(gregorian_year))
def in_gregorian(cls, month, day, gregorian_year):
"""Return list of the fixed dates of Hebrew month, 'month', day, 'day',
that occur in Gregorian year 'gregorian_year'."""
jan1 = GregorianDate.new_year(gregorian_year)
y = HebrewDate.from_fixed(jan1).year
date1 = HebrewDate(y, month, day).to_fixed()
date2 = HebrewDate(y + 1, month, day).to_fixed()
# Hebrew and Gregorian calendar are aligned but certain
# holidays, i.e. Tzom Tevet, can fall on either side of Jan 1.
# So we can have 0, 1 or 2 occurences of that holiday.
dates = [date1, date2]
return list_range(dates, GregorianDate.year_range(gregorian_year))
def mesha_samkranti(g_year):
"""Return the fixed moment of Mesha samkranti (Vernal equinox)
in Gregorian year, g_year."""
jan1 = GregorianDate.new_year(g_year)
return hindu_solar_longitude_at_or_after(0, jan1)
def is_long_year(cls, i_year):
"""Return True if ISO year 'i_year' is a long (53-week) year."""
jan1 = DayOfWeek.from_fixed(GregorianDate.new_year(i_year))
dec31 = DayOfWeek._from_fixed(GregorianDate.year_end(i_year))
return jan1 == DayOfWeek.Thursday or dec31 == DayOfWeek.Thursday
