astroceleste-engine 0.0.3

Astrological chart calculation engine on JPL ephemerides
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160

//! Hermetic lots / Arabic parts (`charts/calc/arabic_parts.py`).

use serde::Serialize;

use crate::aspects::Point;
use crate::pyfloat;
use crate::symbolic::symbolic_degree_number;
use crate::zodiac::{determine_house, longitude_to_zodiac};

struct LotDefinition {
    name: &'static str,
    symbol: &'static str,
    /// (base, add, subtract) by day; swapped add/subtract by night.
    day: (&'static str, &'static str, &'static str),
}

const LOTS: [LotDefinition; 11] = [
    LotDefinition {
        name: "Fortune",
        symbol: "⊗",
        day: ("Ascendant", "Moon", "Sun"),
    },
    LotDefinition {
        name: "Spirit",
        symbol: "🜕",
        day: ("Ascendant", "Sun", "Moon"),
    },
    LotDefinition {
        name: "Eros",
        symbol: "🏹",
        day: ("Ascendant", "Venus", "Spirit"),
    },
    LotDefinition {
        name: "Necessity",
        symbol: "⛓",
        day: ("Ascendant", "Fortune", "Mercury"),
    },
    LotDefinition {
        name: "Courage",
        symbol: "🛡",
        day: ("Ascendant", "Fortune", "Mars"),
    },
    LotDefinition {
        name: "Victory",
        symbol: "🏆",
        day: ("Ascendant", "Jupiter", "Fortune"),
    },
    LotDefinition {
        name: "Nemesis",
        symbol: "⚖",
        day: ("Ascendant", "Fortune", "Saturn"),
    },
    LotDefinition {
        name: "Marriage",
        symbol: "💍",
        day: ("Ascendant", "Venus", "Saturn"),
    },
    LotDefinition {
        name: "Commerce",
        symbol: "☤",
        day: ("Ascendant", "Mercury", "Sun"),
    },
    LotDefinition {
        name: "Sickness",
        symbol: "⚕",
        day: ("Ascendant", "Mars", "Saturn"),
    },
    LotDefinition {
        name: "Death",
        symbol: "☠",
        day: ("Ascendant", "House 8", "Moon"),
    },
];

/// An Arabic part (lot) placed in the chart.
#[derive(Debug, Clone, PartialEq, Serialize)]
pub struct Lot {
    /// Lot name, e.g. "Fortune".
    pub name: &'static str,
    /// Lot glyph.
    pub symbol: &'static str,
    /// Zodiac sign name, e.g. "Taurus".
    pub sign: &'static str,
    /// Zodiac sign glyph, e.g. "♉".
    pub sign_symbol: &'static str,
    /// Whole degrees within the sign (0-29).
    pub degree: i64,
    /// Arc minutes past `degree` (0-59).
    pub minute: i64,
    /// Ecliptic longitude in degrees [0, 360), tropical or sidereal as requested.
    pub ecliptic_longitude: f64,
    /// House (1-12) the point falls in.
    pub house: u8,
    /// Formula applied, e.g. "ASC + Moon - Sun (Day)".
    pub formula_used: String,
    /// Whether the chart is diurnal (Sun above the horizon), which selects the formula.
    pub is_diurnal: bool,
    /// Symbolic degree (1-30) within the sign, as used by degree symbolism.
    pub symbolic_degree: i64,
}

/// The eleven classical lots, with day/night formulas by the Sun's hemisphere.
/// `points` are the planets and angles (by name), `cusps` the twelve house cusps.
pub fn arabic_parts(points: &[Point], cusps: &[f64]) -> Vec<Lot> {
    let find = |name: &str| points.iter().find(|p| p.name == name).map(|p| p.longitude);
    let (Some(sun), Some(_)) = (find("Sun"), find("Ascendant")) else {
        return Vec::new();
    };
    let sun_house = if cusps.is_empty() {
        1
    } else {
        determine_house(sun, cusps)
    };
    let is_day = sun_house >= 7;
    let period = if is_day { "Day" } else { "Night" };

    let mut computed: Vec<(&str, f64)> = Vec::new();
    let mut out = Vec::new();
    for lot in &LOTS {
        let (base, a, b) = if is_day {
            lot.day
        } else {
            (lot.day.0, lot.day.2, lot.day.1)
        };
        let lon_of = |name: &str| {
            if let Some((_, lon)) = computed.iter().find(|(n, _)| *n == name) {
                return *lon;
            }
            if let Some(lon) = find(name) {
                return lon;
            }
            if name == "House 8" && cusps.len() >= 8 {
                return cusps[7];
            }
            0.0
        };
        let lon = pyfloat::rem(lon_of(base) + lon_of(a) - lon_of(b), 360.0);
        computed.push((lot.name, lon));
        let z = longitude_to_zodiac(lon);
        let formula_used = if base == "Ascendant" {
            format!("ASC + {a} - {b} ({period})")
        } else {
            format!("{base} + {a} - {b} ({period})")
        };
        out.push(Lot {
            name: lot.name,
            symbol: lot.symbol,
            sign: z.sign.name,
            sign_symbol: z.sign.symbol,
            degree: z.degree,
            minute: z.minute,
            ecliptic_longitude: lon,
            house: determine_house(lon, cusps),
            formula_used,
            is_diurnal: is_day,
            symbolic_degree: symbolic_degree_number(z.degree, z.minute),
        });
    }
    out
}