Show HN：星图 AI——交互式星图生成器

Hi HN,<p>I built [Astrocartography AI](<a href="https:&#x2F;&#x2F;astrocarto.net" rel="nofollow">https:&#x2F;&#x2F;astrocarto.net</a>), a web app that generates astrocartography maps from a birth date, birth time, and birth place. It plots planetary AS &#x2F; DS &#x2F; MC &#x2F; IC lines on an interactive world map so people can compare places for moving, working, traveling, or just exploring why one city feels different from another.<p>I built it because most astrocartography tools I tried felt hard for first-time users. Many have older interfaces, produce mostly static charts, or assume you already know how to interpret the lines. I wanted to make something that is easier to try and easier to understand without having to learn a lot before getting a useful result.<p>The core chart works without signup. You can enter a city name or raw latitude&#x2F;longitude, generate the map, and then ask follow-up questions about specific cities. I also added an AI reading layer, mainly to turn the chart into practical comparisons instead of leaving users alone with a map full of lines.<p>I know astrocartography itself is a niche topic and not everyone here will care about the premise. The part I found most interesting as a builder was turning a specialized chart format into something interactive, privacy-friendly, and understandable enough for non-experts to actually use.<p>Technically, it is built with Next.js 16, React 19, Leaflet, OpenStreetMap&#x2F;Nominatim, and Swiss Ephemeris. The astrocartography calculation runs on the server instead of embedding a third-party widget. I also tried to keep the flow lightweight: birth data is used for the calculation and not stored permanently as part of the chart generation flow.<p>I would especially love feedback on two things: whether the map and explanations make sense if you know nothing about astrocartography, and whether the no-signup flow is enough to make the product easy to try.<p>Thanks.