How Horoskope reads your chart

Your birth date, time and place are turned into one moment in universal time. The birth place's time zone rules for that date are applied. The positions of the Sun, Moon and planets for that moment come from an astronomical ephemeris, the astronomy-engine library.

The rising sign is computed from the same moment and the latitude and longitude of the birth place. If the birth time is unknown, the chart is cast for midday and the rising sign is left out rather than guessed.

The Western, tropical zodiac counts the signs from the spring equinox. The Vedic, sidereal zodiac counts them from the fixed stars. Each sidereal position is the tropical position minus the ayanamsa, the gap between the two zodiacs.

Today that gap is about 24.2 degrees. A planet in the first 24 degrees of a tropical sign therefore lands in the previous sidereal sign. That is roughly four times in five, which is why the Rashi usually lands one sign earlier than the Western Moon sign.

Horoskope uses the Lahiri ayanamsa, also called Chitrapaksha, as a linear approximation anchored at the year 2000. It starts from 23.85675 degrees and grows by the general precession rate of 50.2888 arc-seconds a year.

Across 1900 to 2100 it stays within about 0.02 degrees of the official Lahiri value. The official value follows small wobbles this model leaves out.

The sidereal zodiac is also divided into 27 nakshatras, the Moon's mansions, each 13°20′ wide and split into four padas. The Moon's nakshatra sets where the dasha cycle starts.

From the birth chart, Horoskope computes 16 divisional charts, each cutting every sign into smaller parts for one area of life:

Finer still, each sign is divided into 150 named slivers of 12 arc-minutes, the nadiamsa, read with the Deva Keralam delineations. That layer needs the birth time to the minute.

Each horizon is read from a different input, so a week is not a day stretched out. The day comes from the transiting Moon against your birth star. The week comes from a seven-day count of the sky.

The month comes from the Sun. The year comes from Jupiter, Saturn and the lunar nodes changing sign, and it runs from your birthday, not from January.

Vedic charts are drawn in two traditional layouts. The North Indian chart is a diamond. Its houses stay in fixed places, the signs move, and the rising sign sits at the top. The South Indian chart is a square grid: the signs stay in fixed places and the houses move.

A Free account draws your full chart both ways, and in both the Vedic and the Western voice.

The trust order is the answer first, the astrology second, and the AI last. Every position, date and window in the free reading on this site is computed by code from the chart, and no language model has any say in them. What a model does is put the result into sentences, after the arithmetic is finished. If it cannot be reached, the same code composes the words too.

In the app, the daily brief is normally written by a language model from the computed chart facts. The model is instructed to cite only positions present in the chart. It is told to make no guaranteed predictions, and none about death, disease or legal outcomes.

Ask, part of Pro, answers questions about your chart. Its answers are written to cite the chart factors behind them, drawing on a knowledge base of over 1,800 passages. That is an instruction to the model, not a guarantee on every answer.

AI text runs on AWS Bedrock, and neither Clevera nor AWS Bedrock uses your content to train foundation models. We never sell your data. Your chart never trains anyone's model. Export or delete everything, any time.

We will never tell you something bad is coming to make you open the app.