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104 this observatory, which he called Stellæburgum (Danish, Stjerneborg), the instruments were placed in subterranean rooms, of which only the roofs rose above the ground, so that they were well protected from the wind. As shown by the view and plan on p. 106, there were five instrument rooms, with a study in the centre, and the entrance to the north. The north-east and north-west rooms were built somewhat later than the others, and were nearly at the

level on the ground. The whole was surrounded by a low wooden paling, forming a square with semicircular bends at the middle of each side, and the sides facing north, south,