It is estimated that Kepler had begun working on Harmonices Mundi sometime near 1599, which was the year Kepler sent a letter to Maestlin detailing the mathematical data and proofs that he intended to use for his upcoming text, which he originally planned to name De harmonia mundi.
Harmonia Mundi | Rex Mundi | Anno Mundi | Anima mundi | Sophia Mundi Steiner School | Sic transit gloria mundi | Rex Mundi (disambiguation) | Regina Mundi | harmonia mundi | Deutsche Harmonia Mundi | Anno mundi |