The Chaldean letter table read to a compound number, alongside the single digit and its planetary ruler.
Cheiro did not invent a letter table - his IS the Chaldean one, the same table /api/astro/numerology/chaldean/ uses. What is his is the reading of the compound number and the planetary rulership of each digit.
WORTH KNOWING: Cheiro's compound meanings are defined for 10-52 only. A compound past 52 is folded back by digit-summing, but a short name never reaches 10 in the first place and a long one can fold below it. In those cases `compound_meaning` is null and `compound_note` says why - read `single_number` and `ruling_planet` instead. We would rather return null than invent a meaning the tradition does not have.
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Notes
date_time
string (date-time)
optional
The moment to calculate for, ISO 8601. ALWAYS include an offset or a trailing Z - a value with no zone is read as Asia/Kolkata (UTC+05:30), not UTC, and can return the previous day's result with a 200. '2026-09-01T06:00:00Z' and '2026-09-01 06:00:00' are different instants and give different answers.