Newcomb, Simon, 1835-1909 · New York, Harper & brothers · leaf 222
e, and to practise the observers in making their observations so as to avoid them, an artificial planet was con- structed to move over an artificial representation of a portion of the solar disk by clock-work. The apparatus was mounted on the top of a building about 3300 feet distant, in order to… … Fig. 55.-Artificial transit of Venus. the fofe. where VenilS entered and left being formed by the sloping edges of a black triangle, as shown in the figure. There was no need of a rep- resentation of the entire sun. The motion was so regulated that the time occupied by the disk in passing from…
Astronomy
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