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I Built a Free Birth Chart Calculator with Live Transit Tracking

Why I built this

Most free astrology sites give you a one-time chart reading and stop there.
I wanted something that treats your natal chart as a starting point,
then keeps showing you how today's sky connects to it — without
requiring signup.

What it does

  • Generates a full natal chart from birth date, time, and place (Western Tropical, Whole Sign houses)
  • Shows your Sun/Moon/Rising ("Big Three") first, before the deeper technical layers
  • Tracks personal transits: what's active now, this week, and the next 30 days
  • Gracefully handles unknown birth times — hides house/Rising results instead of guessing
  • No account needed — charts are saved locally in the browser

Some technical notes

  • Chart calculations are deterministic (ephemeris-based), kept separate from any generated explanation text
  • Saved charts live in browser storage, not a server, by default
  • Built mobile-first with an interactive SVG chart wheel

Try it here 👉 [annorasky.com]

Would love feedback from other devs, especially on the chart
wheel UX or performance on mobile.

Top comments (1)

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_eb3468ba11d30aaf81a0e85 profile image

Happy to answer any questions about the ephemeris calculations
or the chart wheel rendering — this was the trickiest part to get right on mobile.