Star-land : being talks with young people about the wonders of the heavens (1891)
Ball, Robert S. (Robert Stawell), Sir, 1840-1913 · London ; Paris : Cassell & Co. · leaf 34
o eyes when directed at it. In a similar way we judgeof the distance of a heavenly body by making observationson it from two different stations. The Sun. 19 I shall illustrate our method of measuring the actualdistance of a body in the heavens by showing you how wecan find the height of that large… … Fig. 4.—Two eyes are better than one. we measure the distance of the sun or of any other celestialbody which we cannot reach. I will ask the aid of a boyand a girl, who will please stand one at each end of thelecture-table. The apparatus we shall want will be verysimple : it will consist of two…
Astronomy
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