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Primary sourceBook1625

Tychonis Brahei Dani Hyperaspistes

Johannes Kepler · 1625

Kepler's 1625 Latin book defending Tycho Brahe's work on comets against Galileo's criticisms in The Assayer.

Kepler wrote this book himself, defending Tycho Brahe's astronomical work against Galileo.

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Title page of a 1625 Latin book printed in Frankfurt by Godefridus Tampachius. Large capitals read Tychonis Brahei Dani Hyperaspistes, with text naming Johannes Kepler as author. A woodcut of a winged figure playing a trumpet sits above the imprint.
Johannes Kepler, Tychonis Brahei Dani Hyperaspistes, 1625. Printed by Godefridus Tampachius, Frankfurt.

About this source

What it is

This is a 1625 Latin book written by Johannes Kepler and printed in Frankfurt by Godefridus Tampachius. Its title page carries a decorative woodcut of a winged figure with a trumpet above the printer's imprint.

Why it matters

The book defends Tycho Brahe's earlier cometary observations against criticisms made by Galileo Galilei in his work The Assayer. It shows Kepler, late in his career, still deeply involved in the scientific disputes of his time, standing up for his former mentor's legacy while also engaging with one of the other great scientific minds of the era.

Look closer

  • Why might Kepler have felt it necessary to defend Tycho Brahe's reputation years after Tycho's death?
  • What does the decorative title page tell us about how books were produced and valued in the early 1600s?
  • How might disagreements between scientists like Kepler and Galileo have shaped the direction of astronomy?

This book is part of the curated material that grounds the AI version of Johannes Kepler on Humy.ai — when students ask about related events, the AI can quote it and cite it.

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Title page of Astronomia Nova, printed in Latin with mixed roman and italic capitals and a Greek subtitle. It reads Astronomia Nova, Aitiologetos, seu Physica Coelestis, on the motions of the star of Mars, from the observations of Tycho Brahe, by Johannes Kepler, Prague, 1609. A small library stamp appears at the lower left.Book

Secondary source

Astronomia Nova

Johannes Kepler · 1609

Title page of Johannes Kepler's Harmonices Mundi, 1619, printed in Linz, Austria. It lists the five books in Latin, shows a small woodcut vignette of a winged figure, and bears handwritten notes in pencil at lower left.Book

Primary source

Harmonices Mundi

Johannes Kepler · 1619

Title page of Kepler's Mysterium Cosmographicum in Latin, printed in Frankfurt by Erasmus Kempfer for Godefridus Tampachius, dated 1621 (MDCXXI) on this edition. Aged, brownish paper with a red library stamp at right.Book

Secondary source

Mysterium Cosmographicum

Johannes Kepler · 1596 (2nd edition 1621)

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The Martyrs of Science: Galileo, Tycho Brahe and Kepler

David Brewster

Two-page scan of an early 17th-century book: on the left, an engraved frontispiece of a domed rotunda with columns, astronomical instruments and figures, and a tablet reading Tabulae Rudolphinae; on the right, a title page in Latin with large capitals announcing Tabulae Rudolphinae by Johannes Kepler, dated 1627, with a red library stamp at top right.Book

Secondary source

Rudolphine Tables

Johannes Kepler · 1627

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