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Add astrological houses to natal chart and daily transits

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Every planet position now carries its whole-sign house (1-12); transits
report the natal house each transiting planet currently occupies rather
than a fresh "houses for right now" chart, matching how transits are
normally read. Surfaced in both text and HTML output, fully translated.
This commit is contained in:
ml
2026-07-04 12:41:03 +02:00
parent e4ea31270f
commit 57deb62b51
10 changed files with 64 additions and 15 deletions
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engine/src/astro.c
+17
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@@ -86,6 +86,20 @@ static void compute_body_positions(astro_time_t time, PlanetPosition out[NUM_BOD
}
}
/* Whole-sign house number (1-12) for `sign`, counting from `ascendant_sign`
* as house 1. Used both for the natal chart's own placements and (with the
* natal ascendant) for today's transiting planets - see the `house` field
* comment in astro.h for why transits use the natal houses, not their own. */
static int whole_sign_house(ZodiacSign sign, ZodiacSign ascendant_sign) {
return ((int)sign - (int)ascendant_sign + 12) % 12 + 1;
}
static void assign_houses(PlanetPosition bodies[NUM_BODIES], ZodiacSign ascendant_sign) {
for (int b = 0; b < NUM_BODIES; b++) {
bodies[b].house = whole_sign_house(bodies[b].sign, ascendant_sign);
}
}
void astro_compute_natal_chart(const BirthData *birth, NatalChart *out) {
astro_time_t time = time_from_birth(birth);
@@ -96,6 +110,8 @@ void astro_compute_natal_chart(const BirthData *birth, NatalChart *out) {
for (int house = 0; house < 12; house++) {
out->houses[house] = (ZodiacSign)((ascendant_sign + house) % 12);
}
assign_houses(out->bodies, out->houses[0]);
}
static MoonPhaseName moon_phase_from_angle(double angle_deg) {
@@ -129,6 +145,7 @@ void astro_compute_daily_transits(time_t utc_moment, const NatalChart *natal,
astro_time_t time = time_from_unix(utc_moment);
compute_body_positions(time, out->bodies);
assign_houses(out->bodies, natal->houses[0]);
astro_angle_result_t phase = Astronomy_MoonPhase(time);
out->moon_phase = moon_phase_from_angle(phase.angle);