apparent_luminosity(t, base)
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視光度 / magnitude
t : ユリウス日(Terrestrial Time)または(Temporal)Positionオブジェクト
base : When::Coordinates::Spatial or When::Ephemeris::Datum
観測地
919: def apparent_luminosity(t, base)
920: return @luminosity - 2.5*log10(base._coords(t).luminosity_spe(self._coords(t)))
921: end
apparent_radius(t, base=Earth)
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視半径 / CIRCLE
t : ユリウス日(Terrestrial Time)または(Temporal)Positionオブジェクト
base : When::Coordinates::Spatial or When::Ephemeris::Datum
観測地
909: def apparent_radius(t, base=Earth)
910: target_coords = self.coords(t, base)
911: asin(@radius / (target_coords.rr * AU)) / CIRCLE
912: end
axis_of_rotation(t)
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自転軸の歳差補正
t : ユリウス日(Terrestrial Time)または(Temporal)Positionオブジェクト
returns : When::Ephemeris::Coords
880: def axis_of_rotation(t)
881: return nil unless @axis
882: c1900 = (@axis[0]-1900.0)/100.0
883: dt = (+t-(EPOCH2-0.68648354))/BCENT - c1900
884: Coords.polar(
885: (@axis[1][0] + dt * @axis[2][0]) / 360,
886: (@axis[1][1] + dt * @axis[2][1]) / 360,
887: (@axis[1][2] + dt * @axis[2][2]) / 360
888: ).precession(dt, c1900)
889: end
eclipse(t, target, base=Earth)
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食分
t : ユリウス日(Terrestrial Time)または(Temporal)Positionオブジェクト
target : When::Ephemeris::Datum
基準星
base : When::Coordinates::Spatial or When::Ephemeris::Datum
観測地
946: def eclipse(t, target, base=Earth)
947: t = +t
948: distance = self.coords(t, base).spherical_law_of_cosines(target.coords(t, base)) / CIRCLE
949: self_radius = sel.apparent_radius(t, base)
950: target_radius = target.apparent_radius(t, base)
951: return (self_radius + target_radius - distance) / (2.0 * target_radius)
952: end
elongation(t, target=Sun, base=Earth)
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離角 / CIRCLE
t : ユリウス日(Terrestrial Time)または(Temporal)Positionオブジェクト
target : When::Ephemeris::Datum
基準星
base : When::Coordinates::Spatial or When::Ephemeris::Datum
観測地
930: def elongation(t, target=Sun, base=Earth)
931: t = +t
932: self_coords = self.coords(t, base)
933: target_coords = target.coords(t, base)
934: elongation = acos(self_coords.spherical_law_of_cosines(target_coords)) / CIRCLE
935: difference = (self_coords.ll - target_coords.ll + 0.5) % 1 - 0.5
936: return (difference >= 0) ? elongation : -elongation
937: end
equation_of_time(t)
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均時差 / DAY
t : ユリウス日(Terrestrial Time)または(Temporal)Positionオブジェクト
895: def equation_of_time(t)
896: t = +t
897: c = julian_century_from_2000(t)
898: coords = -_coords(t)
899: coords = coords.rotate_z(@aberration / coords.rr / 360) if @aberration
900: coords = coords.y_to_r(t, self)
901: return 0.5 - ((coords.ll - (@sid[0] + c * (@sid[1] + c * @sid[2])) / 24.0) % 1)
902: end
mean_lambda(t)
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光行差を含んだ平均黄経 / CIRCLE
t : ユリウス日(Terrestrial Time)または(Temporal)Positionオブジェクト
858: def mean_lambda(t)
859: coord = _coords(t)
860: coord.c - @aberration / coord.rr / 360
861: end
mean_motion()
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平均運動 / (DEG / YEAR)
849: def mean_motion
850: return @ll[0][2]
851: end
true_lambda(t)
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光行差を含んだ真黄経 / CIRCLE
t : ユリウス日(Terrestrial Time)または(Temporal)Positionオブジェクト
868: def true_lambda(t)
869: coord = _coords(t)
870: coord.ll - @aberration / coord.rr / 360
871: end
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