def set_tropical_date_sunset(self, previous_day_panchaanga=None):
month_transition_jd = None
if previous_day_panchaanga is not None:
tropical_date_sunset_day = previous_day_panchaanga.tropical_date_sunset.day + 1
tropical_date_sunset_month = previous_day_panchaanga.tropical_date_sunset.month
if previous_day_panchaanga is None or previous_day_panchaanga.tropical_date_sunset.day > 28:
nd = zodiac.NakshatraDivision(
jd=self.jd_sunset, ayanaamsha_id=Ayanamsha.ASHVINI_STARTING_0)
fractional_month = nd.get_fractional_division_for_body(
body=Graha.singleton(Graha.SUN), anga_type=AngaType.RASHI)
(month_fraction, _) = modf(fractional_month)
approx_day = month_fraction * 30
month_transitions = Graha.singleton(Graha.SUN).get_transits(
jd_start=self.jd_sunset - approx_day - 5,
jd_end=self.jd_sunset + 4,
anga_type=AngaType.RASHI,
ayanaamsha_id=Ayanamsha.ASHVINI_STARTING_0)
if month_transitions[
-1].jd > self.jd_previous_sunset and month_transitions[
-1].jd <= self.jd_sunset:
tropical_date_sunset_day = 1
tropical_date_sunset_month = month_transitions[-1].value_2
month_transition_jd = month_transitions[-1].jd
else:
tropical_date_sunset_day = len(
self.city.get_sunsets_in_period(
jd_start=month_transitions[0].jd,
jd_end=self.jd_sunset + 1 / 48.0))
tropical_date_sunset_month = month_transitions[0].value_2
self.tropical_date_sunset = time.BasicDateWithTransitions(
month=tropical_date_sunset_month,
day=tropical_date_sunset_day,
month_transition=month_transition_jd)
def compute_solar_day_sunset(self, previous_day_panchaanga=None):
"""Compute the solar month and day for a given Julian day at sunset.
"""
# If solar transition happens before the current sunset but after the previous sunset, then that is taken to be solar day 1.
self.compute_sun_moon_transitions(
previous_day_panchaanga=previous_day_panchaanga)
solar_month_sunset = NakshatraDivision(
jd=self.jd_sunset,
ayanaamsha_id=self.computation_system.ayanaamsha_id).get_anga(
anga_type=AngaType.SIDEREAL_MONTH)
solar_sidereal_month_end_jd = None
if previous_day_panchaanga is None or previous_day_panchaanga.solar_sidereal_date_sunset.day > 28:
anga_finder = zodiac.AngaSpanFinder.get_cached(
ayanaamsha_id=self.computation_system.ayanaamsha_id,
anga_type=AngaType.SIDEREAL_MONTH)
solar_month_sunset_span = anga_finder.find(
jd1=self.jd_sunset - 32,
jd2=self.jd_sunset + 5,
target_anga_id=solar_month_sunset)
solar_sidereal_month_day_sunset = len(
self.city.get_sunsets_in_period(
jd_start=solar_month_sunset_span.jd_start,
jd_end=self.jd_sunset + 1 / 48.0))
if solar_sidereal_month_day_sunset == 1 and solar_month_sunset_span.jd_start > self.jd_sunrise:
solar_sidereal_month_end_jd = solar_month_sunset_span.jd_start
elif solar_sidereal_month_day_sunset == 30 and solar_month_sunset_span.jd_end < self.jd_next_sunrise:
solar_sidereal_month_end_jd = solar_month_sunset_span.jd_end
else:
solar_sidereal_month_day_sunset = previous_day_panchaanga.solar_sidereal_date_sunset.day + 1
from jyotisha.panchaanga.temporal import time
self.solar_sidereal_date_sunset = time.BasicDateWithTransitions(
month=solar_month_sunset.index,
day=solar_sidereal_month_day_sunset,
month_transition=solar_sidereal_month_end_jd)