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sun. The altitude of the sun was thus de-
termined, and, by help of solar tables, the
latitude could be found from observations
made at apparent noon.
[2] See illustration on p. 76.
[3] See Dreyer’s article on these instru-
ments in Copernicus , Vol. I. They were
stolen by the Germans after the relief of the
Embassies, in 1900. The best description
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