Build a birth chart web app with a mobile-first layout. 1. Collect birth date, exact birth time, and birth place with an autocomplete city search that resolves to latitude and longitude. 2. Use an open-source ephemeris library (such as Swiss Ephemeris bindings) to compute planet and house positions; never let the LLM guess astronomical values. 3. Render a clean circular natal chart with zodiac signs, houses, aspects, and planet glyphs as an SVG. 4. Generate a written report with an LLM: personality summary, plus sections for sun, moon, rising, and each major aspect, clearly labeled as interpretations for entertainment. 5. Let users save charts to an account and compare two charts for compatibility. 6. Add a transit-of-the-day feature: today's planetary positions and a short AI reading. 7. Add share cards: a styled image of the chart with the user's sun, moon, and rising for social sharing. 8. Include a disclaimer setting the entertainment expectation and a link explaining how positions are calculated. 9. Handle unknown birth time gracefully: show a solar chart with a clear explanation of what changes.