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David Origanus, Novae motuum coelestium ephemerides Brandenburgicae (Frankfurt on the Oder, 1609)

New Brandenburg Ephemerides of the Celestial Motions

Origanus, also known as David Tost, was a professor of mathematics at Frankfurt who developed a geo-heliocentric system similar to that of Tycho Brahe. Origanus, like Ursus, argued that the Earth rotates on its axis. For him, magnetism explained the Earth’s rotation and in turn the motion of the Earth caused the tides. For Origanus, the region of the stars was immense in its extent. 

This work, first published in 1599, was placed on the Index of Prohibited Books in 1603. The first edition relied upon the Prutenic tables, based on Copernicus; this revised edition employed the more recent tables of Tycho for the Sun and Moon.

Galileo's World Exhibition Location

Source: History of Science Collections

Section: Systems of the World

Section Number: 1

Object Number: 18

Subject Area(s): Astronomy, Physics

Time Period: 16th Century

Region(s): Europe, Germany

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Exhibit Gallery OERs

Phases of Venus: Riccioli, New Almagest

Phases of Venus-Riccioli

The phases of Venus were an item of discussion in early modern Europe as scientists sought to determine whether it was evidence of the heliocentric system. Yet among the scientists it was anything but conclusive that this evidence proved the sun-centered universe. Learn more in this learning leaflet.


Six Cosmological Systems: Phases of Venus

Kircher-Cosmological Systems-Venus

It is often thought that Galileo's discovery of the phases of venus demonstrated the contested heliocentric model of the universe. However, such an understanding is overly simplistic of the early modern account of astronomy. Use this learning leaflet to learn more.


Elisabeth Hevelius: Observational Astronomer

Elisabeth Hevelius Learning Leaflet

How does the Sextant symbolize the person who worked on the famed Hevelius star catalog and star atlas throughout its production, from observation to publication? 

Elisabeth Hevelius, wife of Johann Hevelius, was an astronomer in her own right. They worked together in the observatory of their Gdansk home to measure angular widths and distances with a great sextant, which required two observers at a time. The Sextant was among the new constellations they proposed in Uranographia (1690), the most detailed and influential celestial atlas of the 17th century. The Uranographia contains 54 beautiful double page engraved plates of 73 constellations, and 2 oversized folding plates of planispheres.