Transparency

Methodology & Limitations

Discover Yourself separates astronomical calculation from reflective interpretation so you can understand what is computed and what is interpretive.

Birth charts and transits

Birth chart positions for the Sun, Moon and planets to Neptune come from the full VSOP87 planetary theory and the ELP-MPP02 lunar theory (the astronomia library), which agree with the Swiss Ephemeris to within a few arcseconds; Pluto, planetary motion and transits use the astronomy-engine library. The Ascendant, Midheaven and house cusps use the true obliquity and apparent sidereal time of the birth moment. House placement uses the Placidus system where supported, with documented fallbacks at extreme latitudes. Accurate results depend on an accurate local birth time, coordinates, and historical timezone.

Lunar nodes, Part of Fortune, Lilith and the Vertex

The lunar nodes use the mean node, a smoothed average of the Moon’s crossing point. (Our Human Design chart uses the true node instead, as Human Design sites do; the two can be up to about 1.8° apart.) The South Node is exactly opposite the North Node. Part of Fortune uses the day and night formula: by day, Ascendant + Moon − Sun; by night, Ascendant + Sun − Moon. A birth is a day birth when the Sun’s centre is on or above the horizon. Part of Fortune and the Vertex need an exact birth time; without one they’re marked approximate. Lilith is the mean lunar apogee. Planets that sit within 3° of a point are listed as conjunctions.

Astrocartography

Map lines are derived from the angular position of planets relative to locations on Earth. Suggested cities are ranking aids, not evidence that an event or outcome will occur in a location.

Numerology

Core numbers use the Pythagorean letter-to-number convention and digit reduction, preserving master numbers where the relevant calculation calls for them.

Human Design

A Human Design chart uses two moments. Your Personality is the sky at your birth; your Design is the moment, roughly 88 days earlier, when the Sun stood exactly 88° of longitude behind its birth position. We find that moment by searching the Sun’s position rather than counting days. At each moment we take 13 positions (Sun, Earth, both lunar nodes, Moon and the planets from Mercury to Pluto) from the astronomy-engine library, using the true lunar node rather than the mean node. Its positions can differ from the birth chart’s by a few arcseconds, far less than a gate line (0.9375°).

Each position falls in one of 64 gates of 5.625° on the zodiac, and each gate has six lines. Two gates at either end of a channel define that channel, a defined channel defines the two centers it joins, and the pattern of defined centers sets your type, authority and definition. The bodygraph is drawn from our own coordinates.

Other Human Design sites can disagree on a line, occasionally a gate, when a position sits right on a boundary. The usual causes are the node (mean or true), the Design moment (88° of Sun, or a flat 88 days), the ephemeris, and the birth time. The Moon moves about one line an hour, so we recheck your chart 15 and 60 minutes either side and name anything that would change.

Interpretations

Written interpretations synthesize traditional symbolic systems for reflection. Astrology and numerology are not scientifically established methods for predicting personality or future events. Treat results as prompts for curiosity rather than instructions or diagnoses.

Improving accuracy

Use the birth time recorded on an official record when possible. If the time is unknown, chart angles, houses, and astrocartography lines may be unreliable even when planet signs are correct.