A schematic of Tycho Brahe's subterranean astronomical observatory Stjerneborg (Stelleburgi).
This plan-view schematic shows the observatory bounded by a square wall with semi-circular extensions on each side, the entrance on the left lies in the direction of the nearby palace Uraniborg. Annotations are:
* A = Entrance with steps leading down into the main workroom (B) and (D) and (E), above are three lion sculptures and Latin inscriptions
* B = The main Workroom containing (P) and (V) and passages to (C), (F), (G), and (Q)
* C = chamber with large equatorial instrument
* D = chamber with elevation and azimuth quadrant
* E = chamber with armillary sphere
* F = chamber with elevation and azimuth quadrant encompassed by a steel square
* G = chamber with sextant for measuring distances
* H = stone pillars one with a ball on top, the other angled, situated at the near side
* I = stone pillars one with a ball on top, the other angled, situated at the far side
* K, L, N and T = large balls, with conical covers, used for mounting instruments
* M = Stone table, shown with sundial in Willem Blaeu's drawing
* O = bed of Tycho Brahe
* P = fireplace
* Q = Tycho's assistant's bedroom
* S = beginning of an underground passage to Uraniborg
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