Your sky on the night you were born
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ATLAS is a free astronomy tool by SYGNS (Denmark+Winter Entertainment) that reconstructs the exact sky over your birthplace at the moment you were born. It combines real astronomical data — the Swiss Ephemeris for planetary positions, the US Naval Observatory for lunar data, and the HYG Star Catalog (Hipparcos, Yale, Gliese) for star positions — with plain-language readings so anyone can understand their birth chart.
ATLAS has five modules:
The ATLAS website is 100% free — all five modules, no cost and no subscription. ATLAS also appears inside the SYGNS app (as the natal chart, with a doorway into your full birth chart), which has its own pricing: a generous free tier, a free first month of the full experience, then Alpha (subscription) or Omega (pay-as-you-go credits). See the Resources page for the full breakdown.
Resources — how ATLAS works, the data behind it, pricing, and frequently asked questions.
Your sky on the night you were born
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