Øster Voldgade 4A - Rosenborg Castle
Rosenborg Castle, Øster Voldgade 4A
Now a museum, this castle houses the Danish Royal Collections. In its basement, which also contains the Green Cabinet and the Treasury, there is an Ole Rømer Room, in which are displayed:
A Planetarium (Museum Catalogue Number 3700), a planet machine constructed by Ole Rømer to demonstrate the orbits of the planets around the Sun. It was made in Paris in 1678-1679 by Isaac Thuret, royal clockmaker.
An Eclipsarium (Number 3702) constructed by Ole Rømer to calculate the orbit and eclipses of the Moon. It was made in Paris in 1678-1679 by Isaac Thuret, royal clockmaker.
The original ‘‘national standard prototypes'' of the weights and measures system introduced by Ole Rømer, which were presented to the Danish King Christian V in 1683-1684 (Numbers 3704, 3706, 3708, 3710, 3712, 3714, 3716, 3718).
Among the other curiosities may be mentioned Frederik VII's general's helmet made of aluminum by J. B. Dalhoff (1859), at a time when lightweight aluminum was a new and precious metal (Room 18, Number 1828).
The catalogue, Rosenborg Castle: A Guide to the Danish Royal Collections (Copenhagen: 2005), can be purchased in the museum shop