Ad epistolam clarissimi viri d. Jacobi Bartschi, ... Praefixam ephemeridi in annum 1629... De computatione et editione ephemeridum.
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Ioannis Keppleri mathematici, ad epistolam clarissimi viri D. Jacobi Bartschij laubani lusati, medicinae candidati, praefixam ephemeridi in annum 1629, responsio
Rare first edition of this public letter by astronomer Johannes Kepler to the young Jacob Bartsch, and an important biographical source for the astronomer's life and final years. The publication of the Rudolphine Tables in 1627 provided a great stimulus to the calculation of ephemerides, among them one produced by the young Strasburg scholar Jacob Bartsch, Uraniburgum Strasburgicum. In the latter publication, Bartsch offered to collaborate with Kepler, and in the present letter, the elder astronomer accepts and outlines a research program for the future.
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