The labors of Kepler were mathematical, optical, cosmographical, and
astronomical,--but chiefly astronomical. Two or three of his principal
works are the "Cosmographic Mystery," (_Mysterium Cosmographicum,_) the
"New Astronomy," (_Astronomia Nova, seu Physica Caelestis,_) and the
"Harmonies of the World" (_Harmonices Mundi_). His whole published
works comprise some thirty or forty volumes, while twenty folio volumes
of manuscript lie in the Library at St. Petersburg. These Euler,
Lexell, and Kraft undertook some years ago to examine and publish, but
the result of this examination has never appeared. An elegant complete
edition of the works of Kepler is at present being issued at Frankfort,
under the editorship of Frisch.[1] It is to be in sixteen volumes, 8vo,
two of which are published. For his biography, the chief source is the
folio volume of Correspondence, published in 1718, by Hansch,[2] who
has prefixed to these letters between Kepler and his contemporaries a
Life, in which his German heartiness beats even through the marble
encasement of his Latinity.
[Footnote 1: _Joannis Kepleri Astronomi Opera Omnia._ Edidit CH.
FRISCH.]
[Footnote 2: _Epistolae ad Joannem Keplerum scriptae.
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