DE440 dynamics
1550–2650
General-purpose planetary and lunar dynamical coverage. Exact chart availability is the intersection of every requested body and coordinate meaning.
Astrotechne Engine
Built from scratch for serious astrology
Astrotechne runs its own calculation engine so chart math, timing techniques, report evidence, and source-aware rules can be handled consistently.
The engine is not a wrapper around a generic astrology API. It is Astrotechne's own calculation layer, built so natal charts, timing techniques, election searches, relationship analysis, transit analysis, and report evidence all draw from the same rules and astronomical positions.
CALCEPH is the astronomy library Astrotechne uses to read high-precision JPL ephemerides: tables that describe where planets, asteroids, and other bodies are at a given time.
That astronomical foundation is separate from the astrology-specific layer: techniques, reviewed astrological sources, doctrine categories, and report-ready interpretation structure.
Current production surfaces include Election Finder and Transit Calculator. Generated reports remain the stable document workflow.
API contract version
0.1.0
Capability manifest version
2026-08-19
Astronomy foundation
CALCEPH ephemerides
Astronomy data
JPL ephemerides
Interpretive basis
Reviewed astrological sources
Production surfaces
Election Finder and Transit Calculator
Ephemeris and fixed-star coverage
Coverage is reported by authority and coordinate meaning; a wide dynamical kernel never silently widens a narrower planet-center, Earth-orientation, or fixed-star validity interval.
Hosted full charts
1800–2198
Conservative complete-year picker window. The current JPL/NAIF NEP098 physical-Neptune authority ends at 2199-12-31T00:00:00 TDB, so 2199 is not a complete supported year. The engine still validates the exact timestamp.
Explicit DE441 tier
-13200–17191
Available to explicit offline and CLI workflows, not hosted chart defaults. DE440 remains preferred near the modern epoch because it is more accurate there.
Research-eligible stars
201
IAU/WGSN identities with warning-free six-dimensional astrometry inside the request-specific uncertainty budget.
Typed unavailable stars
393
Named identities retained without invented coordinates when component, covariance, radial-velocity, or epoch evidence is insufficient.
9 capability families
The public API groups related calculations into these families. Aliases, presets, and batch options are not counted as separate capabilities.
9 capabilities
Charts and chart foundations
Core chart calculation, relocation, returns, lunations, eclipses, and sky paths.Chart calculation, Chart primitives, Relocation, Returns, Lunations, Prenatal syzygy, Eclipse contacts, Orbital data, Sky paths
4 capabilities
Relationships and comparisons
Relationship and comparison chart analysis.Relationship analysis, Relationship Dynamics baseline, Relationship activation timelines, Chart comparison
6 capabilities
Timing and forecasting
Traditional timing variants, progressions, transits, and event searches.Traditional timing variants, Secondary progressions, Secondary progression events, Transit hits, Transit scan, Transits
1 capabilities
Election searches
Search for candidate times matching election constraints.Election search
8 capabilities
Mundane astrology
Mundane, financial, horary, medical, midpoint, and Uranian calculations.Decumbiture, Financial astrology, Heliocentric astrology, Horary, Ingresses, Midpoints, Moving-body aspects, Uranian astrology
2 capabilities
Astronomy and sky geometry
Ephemeris authority, body-center coverage, and astronomical geometry.Ephemeris coverage, Astrocartography angular lines
3 capabilities
Asteroids and fixed stars
Named-asteroid reports and fixed-star contact and paran analysis.Asteroid reports, Deep-sky catalog and projection, Fixed-star analysis
2 capabilities
Interpretive evidence
Structured reasoning evidence and reviewed public descriptions.Chart reasoning evidence, Reference descriptions
11 capabilities
Reference catalogs and source registries
Citations, lots, registries, vocabularies, and supported option catalogs.Citations, Lots, Lot explanations, Lot formulas by sect, Named asteroids, Support groups, Mundane chart registry, Rule registry, Searchable chart facts, Vocabulary registry, Settings options
Doctrine and reference libraries
Astrotechne keeps interpretation rules close to their source material, so calculations can point back to reviewed citations and stable doctrine categories.
Public reference coverage
343 descriptions
Reviewed public descriptions connect terms, methods, people, and source material to the engine's reference corpus.
Doctrine group
Annual Timing
Yearly, periodic, and return-based methods for organizing astrological time.
Doctrine group
Directions And Life Periods
Directional, circumambulatory, climacteric, and lifespan timing methods.
Doctrine group
Planetary Condition
Dignity, sect, motion, reception, and related ways of assessing planetary condition.
Doctrine group
Chart Structure
Houses, signs, aspects, derived points, and other structures used to organize a chart.
Doctrine group
Lots
Calculated lots and related formula-backed chart points.
Doctrine group
Relationships And Interactions
Aspectual testimony, planetary relationships, and medieval interaction doctrines.
Doctrine group
Visibility And Events
Visibility states, phasis, heliacal phenomena, and observed-event reference material.
Doctrine group
Lunar And Sidereal Frameworks
Lunar mansions, sidereal frameworks, and non-Vedic lunar-zodiac systems.
Doctrine group
Vedic Astrology
Nakshatras, Vedic source rows, and future reviewed Jyotish timing or interpretive surfaces.
Doctrine group
Electional Workflows
Applied electional techniques and workflow groupings for choosing astrological moments.
Doctrine group
Mundane Astrology
Mundane and collective reference material where reviewed rows are available.
Doctrine group
Source Method
Source handling, calculation footing, and method boundaries.
15 traditional timing variants
Forecast and lifetime timing techniques available now.
Timing technique
Annual profections
A yearly house-and-planet emphasis used to frame the main topic of a year.
Timing technique
Annual return divisions
Yearly return charts divided into smaller periods for month-by-month emphasis.
Timing technique
Circumambulations
A traditional timing method that follows a chart point through directed periods.
Timing technique
Climacteric years
Age-based milestone years treated as stronger turning points in some traditions.
Timing technique
Decennials
Ten-year rulership periods used to describe longer chapters of life and emphasis.
Timing technique
Firdaria
Planetary periods from medieval astrology, organized as major and minor rulers.
Timing technique
Length-of-life techniques
Historical longevity calculations preserved as source-backed research material.
Timing technique
Lord of the orb
A traditional way of assigning period emphasis through planetary rulership.
Timing technique
Novenaria
Nine-part timing periods used to break a life or year into smaller chapters.
Timing technique
Phasis
Visibility events that mark when a planet emerges, disappears, or changes emphasis.
Timing technique
Planetary hours
Day and night divisions assigned to planetary rulers for short-range timing.
Timing technique
Primary directions
A symbolic timing method based on the motion of the heavens after birth.
Timing technique
Planetary returns
Moments when a planet returns to its natal position, such as solar returns.
Timing technique
Planet visibility
Astronomical visibility conditions used to judge whether a planet can be seen.
Timing technique
Zodiacal releasing
A Hellenistic timing method that divides life into topic-based periods.