Accuracy, in public

"Different sites gave me different charts" is the most common complaint in this field. Here is our entire accuracy method — and its current results — on one page.

1 · Ephemeris

Planetary positions come from a VSOP87-class theory (with a dedicated outer-planet integrator for Pluto), compared against NASA JPL Horizons reference values at every engine release. Current agreement across Sun, Moon and all planets: better than 0.001° — about 4 arc-seconds, thousands of times finer than a gate line (0.9375°).

2 · The design moment

We solve numerically for the instant the Sun was exactly 88.000000° of ecliptic longitude before your birth Sun — not "88 days," which is an approximation. The difference matters for anyone born near a gate boundary.

3 · Timezones

Birth times are converted with the platform's full IANA tz database — including historical daylight-saving quirks and pre-1920 local mean time. Nonexistent clock times (spring-forward gaps) are flagged on your chart, as are fall-back ambiguities.

4 · End-to-end anchor charts

Every engine release re-computes five public figures' charts from their documented birth data and checks type, profile, authority, definition, centers, channels and Sun gate against independently published records:

Person	Type	Profile	Authority	Definition	Sun gate.line
Barack Obama Aug 4, 1961 · 7:24 PM · Honolulu, HI	Projector	6/2	Emotional	Single	33.6
Steve Jobs Feb 24, 1955 · 7:15 PM · San Francisco, CA	Generator	6/3	Emotional	Split	55.6
Oprah Winfrey Jan 29, 1954 · 4:30 AM · Kosciusko, MS	Generator	2/4	Emotional	Triple Split	19.2
Ra Uru Hu Apr 9, 1948 · 00:05 · Montreal, Canada	Manifestor	5/1	Splenic	Single	51.5
Albert Einstein Mar 14, 1879 · 11:30 AM LMT · Ulm, Germany	Generator	1/4	Emotional	—	36.1

Birth data: Astro-Databank (Rodden AA). Published charts: Genetic Matrix, cartaora.com, xanion.net. These five currently pass 100% — the same table runs as an automated test in our engine's release suite.