Ven was later lost to Sweden, and the Rundetårn (Round Tower) in Copenhagen was inaugurated in 1642 as a replacement for Uraniborg's astronomical functions.

These proportions may have been intended to make Uraniborg function as an astrological talisman, benefiting the health of its occupants by increasing the influences of the Sun and Jupiter.

In this library and within Brahe's personal study is etched the motto "Non haberi sed esse," which translates from Latin to "What one is, is more important than what one is perceived to be.

Balconies, supported on wooden posts, housed additional instruments slightly further from the building, giving them a wider angle of view.

[6] Extending beyond the walls, Uraniborg's surrounding infrastructure included a system of aquaculture ponds, whose overflow powered a paper mill.

[10] Upon losing financial support from Frederick II's successor, Christian IV of Denmark, Brahe abandoned Ven in 1597.

Over the lifespan of Uraniborg it had upwards of thirty different assistants for Tycho Brahe,[14][page needed] and visits from many other researchers and royalty; Martin Zeiler, Nicolaus Reimers, Erik Lange, and David Wunderer being some of the noted visitors.

[4] During the period in which Uraniborg was actively used, astronomy and astrology were thought to be linked to the other scientific fields, and as such the observatory was used to discover more than the astral bodies.

[19] Brahe's driving force for research at Uraniborg was the desire to make astrology an empirical science and rid it of "mistakes and superstition.

"[3] Brahe and his many assistants began charting the positions of stars, planets, and other celestial bodies over time with unprecedented accuracy in this pursuit.

Brahe's underground laboratory was designed to allow sunlight in throughout the day and had furnaces arranged so he could do his research even in the coldest months.

[4] For example, Brahe allowed Arnold van Langren and Willem Jansz Blaeu, who were prominent Dutch globe makers of the time, access to his and his many assistants' work.

[20] On his deathbed in 1601, Brahe urged Kepler to publish his proprietary Rudolphine Tables on Mars using his own cosmic system as the basis of explanation.

[10] The result was Stjerneborg ("castle of the stars"), a smaller site built entirely at ground level and dedicated purely to observations (there was no "house").

[25] Brahe's goal to gather accurate data on the cosmos influenced the creation of a wide range of contraptions to prove his theories on the celestial positions and a geo-heliocentric (Tychonic) model of the Solar System, a theory that the Earth is the center of the Sun and Moon while the Sun is also the center of the other planets.

[27] In 1580, Brahe created the Great Globe, a hollow, wooden sphere layered with brass plates to document the stars and planets he observed.

[27] In 1585, Brahe created a larger instrument called the Great Equatorial Armillary, which allowed him to gauge planetary and stellar positions.

[27] This device was used extensively by Brahe in 1587 to further his work on the determination of Martian parallax, which he had previously attempted to calculate in 1582, 1583, and 1585, but without success due to the unavailability of the proper technology.

[30] Though scientists have determined in retrospect that Brahe could not have come to a meaningful conclusion due to errors in commonly used refraction tables of the era, the measurements taken by the Great Equatorial Armillary in conjunction with his other instruments led to unprecedented accuracy in his results and calculations.

The other smaller instruments that were more sensitive to interference from the weather were also fixed in place; they were installed in recesses in the ground to provide greater protection from the wind while still having the ability to measure stellar features.

The new site now includes a restored quarter of Brahe's original garden with plants and herbs laid out in beds that are also boxed in with a wooden fence.

[31] The grounds include stops at the ruined paper mill and the replica lake that once powered the palace laboratory during the time of Tycho Brahe.