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XV. Astronomy: 914.
XV. Astronomy: 914.
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XV. Astronomy: 914.

914.

p. 171

Observations on the stars.To see the real nature of the planets open the covering and note at the base 490 one single planet, and the reflected movement of this base will show the nature of the said planet; but arrange that the base may face only one at the time.

Footnotes
  1. 171:490

    4: basa. This probably alludes to some instrument, perhaps the Camera obscura.

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