How readings are made

Planet positions come from Astronomy Engine, an open-source astronomy library, run on our own server. Positions are geocentric ecliptic longitudes of date. We check them against published reference charts in automated tests.

Birthplaces are converted to coordinates, and local birth times to universal time using the historical time-zone rules for that place and date, including daylight saving time. When a local time happened twice, because the clocks went back, we ask which one you mean.

Western tropical zodiac, measured from the March equinox. Whole-sign houses. Major aspects only: conjunction, sextile, square, trine, and opposition, with stated orbs. Synastry uses tighter orbs and leaves out contacts between slow outer planets, which everyone born in the same years shares.

Without a birth time, we leave out the Rising sign, Midheaven, and houses rather than guess them, and we tell you when the Moon changed sign that day.

Each reading is assembled from a library of interpretations we wrote for every placement, aspect, and house, following traditional meanings. The template for each product decides which placements are read in which chapter.

When AI assistance is turned on, a language model may rewrite that draft so it reads more naturally. It's given only the calculated chart and the draft. It's told not to add placements, dates, predictions, or scores.

Before a reading is saved, an automated check compares every sign and house it mentions against the calculated chart, and rejects claims that need a birth time when there isn't one. It also rejects language that promises events, relationships, health outcomes, or money. If an AI rewrite fails the check, we use the original draft.

A reading is generated once and saved. Opening it again doesn't rewrite it.