Compute a natal astrological chart for a given time and location. Returns JSON with each body's longitude, latitude, speed, sign, house, dignity and retrograde flag, the house cusps with ascendant and MC, the aspects, and the ayanamsha applied. Pass a sidereal ayanamsha for a Vedic chart (kundali); the default is tropical. To get a property graph, pass this output to emit_graph.

Compute Vedic dasha (planetary period) sequences. Supports eight classical systems: Vimshottari, Ashtottari, Yogini (Moon-longitude based, require moon_longitude); Chara, Narayana (sign based, require BOTH lagna_sign AND graha_signs, since each sign's period length is counted to the sign its lord occupies in this chart); Sthira, NiryanaShoola (niryana_shoola is accepted too) and Maheshwara (Jaimini rashi dashas, require lagna_sign AND graha_longitudes, since the atmakaraka and the tie-breaks of the strength tests read degrees). graha_signs takes the eight sign_index values compute_natal_chart already returns, graha_longitudes the eight sidereal longitudes; Ketu is derived from Rahu and must not be supplied. Yogini takes rounds (1 to 10 whole 36-year rounds) or until (a horizon Julian Day); Chara takes antardashas (twelve per period, BPHS 51.5-51.9). Sthira, NiryanaShoola and Maheshwara use the defaults of the vedic crate's dasha functions (see their module docs) and always carry their antardashas. Sthira and Maheshwara start from the Brahma graha; a chart whose marks leave none returns no_brahma: true with a message, not an error. Returns a JSON dasha tree with start/end Julian Days.

Compute Jaimini Chara Karaka assignments from sidereal planet longitudes. Ranks planets by degrees within their current sign: highest = Atmakaraka (soul significator), lowest = Darakaraka (spouse significator). Supports 7-karaka (Sun–Saturn) and 8-karaka (adds Rahu) schemes.

Compute combustion state for each planet relative to the Sun: principle per BPHS Ch.7 vv.28-29, orbs per Surya Siddhanta IX.6-8 and X.1 (Moon 12, Mars 17, Mercury 14 or 12 retrograde, Jupiter 11, Venus 10 or 8 retrograde, Saturn 15 deg). Returns Combust, DeeplyCombust, or None for Moon, Mars, Mercury, Jupiter, Venus, Saturn with degrees of separation. This is a low-level tool over already-known positions, not a natal-chart tool: call compute_natal_chart first and pass its planets[].longitude (matched by planets[].name) and planets[].retrograde values straight through as this tool's inputs — do not recompute or re-derive them.

Compute the complete six-fold Shadbala of the seven grahas (Sun to Saturn) for a birth moment and place, per BPHS Ch.27, with Ishta and Kashta Phala per Ch.28, in virupas. Pass the moment and the place; the tool casts the chart itself and reads sunrise, sunset and the next sunrise from the engine. Every part is in the output, each in its own field: Sthana (uccha, saptavargaja, ojhayugma, kendradi, drekkana), Dig (continuous, the arc from the weak cusp over 3, 27.7), Kala (nathonnata, paksha, tribhaga, abda, masa, vara, hora, ayana and yuddha, which is signed), Cheshta (the cheshta kendra for Mars to Saturn, the Sun's ayana and the Moon's paksha bala, 27.18 and 27.24-25), Naisargika and Drik (a quarter of the benefic sphuta drishti added, a quarter of the malefic taken away, the aspect of Mercury and Jupiter added whole, 27.19; it can be negative or pass 60). The Sun's ayana and the Moon's paksha bala are counted once in kala and once in cheshta, each undoubled. The rules are the verses' defaults; the benefic and malefic grahas are those of BPHS 3.11, with Rahu (the mean node) and Ketu counting only as malefic company for Mercury. Each graha also carries its motion state (vakra, anuvakra, ... atichara, 27.21-23) against the mean geocentric motion; it is reported beside the strengths and is not part of any total. The Sun must both rise and set at the place: in the polar day or night there is no Hindu day to divide into thirds and horas, and the call fails by name.

Compute Vedic divisional charts (vargas). Given a time and place, returns one chart per requested division: the varga lagna, and for each of the ten bodies compute_natal_chart returns — the seven grahas plus the mean, true and osculating lunar node — its rashi longitude, the sign it occupies within that varga, its dignity in that sign, and its whole-sign bhava counted from the varga lagna. Ketu is not listed separately: it is the node's opposite point, 180 degrees away. The nodes carry no dignity, so that field is absent for them. Supply planet_longitude instead to divide a single longitude without an ephemeris lookup, in which case no graha name, dignity or bhava is returned because none is defined. Vargas are classically read on a sidereal zodiac: pass an ayanamsha, or accept the Tropical default this surface uses everywhere. Source: BPHS Ch. 6-7.

Turn a chart into a queryable property graph. Accepts the output of compute_natal_chart directly (pass latitude and longitude alongside it), or an existing ChartGraph. Emits Neo4j Cypher, SurrealDB SurrealQL, JSON-LD, plain JSON, or RAG embedding text.

Compute transiting planet positions relative to a natal chart at a specific moment. Returns planet longitudes for the transit time alongside natal positions, enabling aspect calculation between transit and natal placements.

Search for transiting planet–natal planet aspects within a time window. Supply natal positions and a Julian Day range; receive a list of exact transit moments with aspect type, orb, and applying/separating status.

Search for auspicious time windows (muhurta) within a given period for a geographic location. Returns ranked muhurta candidates with quality scores based on tithi, nakshatra, yoga, karana, and planetary positions. The search window is capped at 30 days (see MUHURTA_SEARCH_RANGE_TOO_LARGE), a scope limit; for a longer horizon, issue several searches.

Compute Bhinna Ashtakavarga (raw bindu tables) and Sarvashtakavarga for all 7 planets from sign positions. Source: BPHS Ch.66 vv.13-68. Trikona/Ekadhipatya Shodhana and Pinda Sadhana are not included.

Compute Gochara (transit interpretation) for the seven grahas against a natal reference sign per BPHS Ch.29. Returns favourable/unfavourable verdict, house from natal, and raw vedha (obstruction) candidates per planet. The natal reference sign is the caller's choice — typically the natal Moon's sign (Chandra Gochara) or the natal Lagna's sign. Rahu and Ketu are not included.

Compute the panchanga — the five limbs of the Vedic almanac — for an instant: tithi (lunar day, with paksha and lord), vara (weekday reckoned from local sunrise, with its lord and the Rahu and Gulika Kalam windows as Julian Days), nakshatra (with pada), yoga (one of the 27 nithya yogas, with degrees remaining), and karana (half-tithi). Takes sidereal longitudes; all returned instants are Julian Days (UT). vara.from_sunrise reports HOW the weekday was reckoned: true means it was taken from an actual local sunrise (the Vedic definition); false means no sunrise exists to reckon from — the polar day or polar night, above about ±66.5° latitude — and the value is the observer's local CIVIL weekday as a documented fallback, which is a different quantity. Check it before presenting the vara at high latitude. vara.rahu_kalam being null is NOT the same signal: the Kalam windows can also be null while from_sunrise is true.

Compute graha drishti — Vedic sign aspects — for all nine grahas. Unlike Western aspects, drishti is cast from sign to sign and is asymmetric: every graha aspects the 7th from itself, and Mars additionally aspects the 4th and 8th, Jupiter the 5th and 9th, Saturn the 3rd and 10th. Returns each aspect with its graded strength (Full, ThreeQuarter, Half, Quarter) and the house distance.

Compute the whole-sign bhava (house) chart from an ascendant. In the Vedic whole-sign system the entire sign containing the ascendant is the 1st bhava, the next sign the 2nd, and so on — houses do not have cusps within signs. Returns the sign of each of the twelve bhavas with its kendra / trikona / dusthana / upachaya classification, and optionally places supplied grahas into their bhavas.

Compute synastry — the aspects each graha in one chart makes to each graha in another chart. Every graha in chart A is tested against every graha in chart B (the two charts do not need the same graha names), and each hit is returned with its aspect type, orb in degrees and strength (1.0 at exact, falling linearly to 0.0 at the orb boundary). Orbs are the traditional Lilly values — conjunction, trine and opposition 8°, square 7°, sextile 6°, minors 2° — scaled by orb_factor. Longitudes only: this tool needs no birth time, place or ephemeris.

Compute the midpoint composite chart of two charts: for each graha, the shorter-arc midpoint of its longitude in the two charts, and the arithmetic mean of its two speeds. The two charts must carry the SAME graha names — each graha is paired with its namesake, not with whatever happens to sit at the same position in a list — and a name present in one chart but not the other is an error naming that graha. Longitudes only: this tool needs no birth time, place or ephemeris.