Thankfully, we have astrology software now, making it possible to calculate a complete birth chart in less than a second.
Back in the day, the only way to calculate a birth chart was by hand, using a protractor and a table known as an ephemeris. Thankfully, we have astrology software now, making it possible to calculate a complete birth chart in less than a second. To that end, TimePassages is my favorite app (available on both iOS and Android) for rendering birth charts, along with the website astro.com.