Astrology that respects the sky.

Most people meet astrology through a horoscope column — one paragraph written for a twelfth of the planet. It can be fun, but it isn't yours. Sigastra exists to close that gap: to give anyone, in their own language, the same starting point a serious astrologer uses — a real natal chart — and a reading that actually reflects it.

We want the moment you first see your chart to feel like recognition, not a gimmick. That means getting the astronomy exactly right, and then writing about you with warmth and specificity.

Most AI “horoscopes” invent positions or read your Sun sign back to you. Sigastra starts from real, computed astronomy — the same ephemeris professional astrologers use — then explains it in plain language.

Generative AI is remarkable at language and unreliable at facts. Ask a chatbot for your chart and it will often invent planetary positions, or quietly fall back to your Sun sign. We refuse to do that. Sigastra computes every placement deterministically first, then uses AI only to interpret — never to guess the sky.

1. Your birth moment. Enter your date, exact time and place of birth — the three details that fix the sky.

2. Real astronomy. We compute your chart from Swiss Ephemeris data and the correct historical timezone. No guessing.

3. Your reading. You get readings written for your exact chart — in your language, in words that sound like you.

Deterministic Swiss Ephemeris calculations, historically-correct timezones, and 15 languages. Your chart is never invented. Birth time matters more than people expect — it sets your Rising sign and the house cusps, and even old daylight-saving rules can shift them. We handle the historically-correct timezone for your city so the chart is right, not approximately right.

Sigastra is built and operated by Sigvanta LLC, a limited liability company registered in Wyoming, USA. We run a small, focused product and take privacy seriously: your birth details are used to compute your chart, payments are handled by Stripe, and the non-identifying chart data — never your name or email — is what powers the AI interpretation.

Honesty about inputs. If a number is computed, we compute it. If something is interpretation, we say so.

For insight, not fear. Everything Sigastra writes is for reflection and entertainment — never medical, financial or legal advice, and never determinism.

Your language, your chart. Astrology shouldn't only be good in English. We write natively across 15 languages.