Compares two people's birth charts: their Sun, Moon and rising signs, the closest contacts between their planets with what each traditionally means, and how their elements balance. Use it when someone asks about compatibility with a partner, friend or family member, or with a famous person. Each person needs a birth date; add a birth time, time zone and birthplace coordinates when known, and first names if they want them shown. To compare someone with a famous person Zodiacs publishes, give that side as { famous: "" } instead: it uses their published chart for noon on their birth date, without a Moon or rising sign, and links to their page. If Zodiacs has no chart for that name it says so (found: false); never make one up. It returns a compatibility score out of 100 with scores for attraction, communication and long-term stability, a verdict and a headline: lead with the score and verdict in plain words, then the strongest and hardest contacts. Present it as astrology's reading, never a guarantee of how the relationship will turn out. If they want to share the score, give them the returned shareUrl exactly.