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 38
o use amuch more accurate way of measuringthe angles than by cutting out cards withpairs of scissors; and as the astronomerat A is not able to see his friend at b, it becomes noeasy matter to measure the angles accurately. How-ever, we need not trouble about the difficulties; it wil)suffice that… … Fig. 7. This would beour base-line whenfinding the Suns dis-tance. 24 Star-Land. the earth, and thus they know how many thousands ofmiles lie between them when making the observations.This distance means in their drawing what the length of thetable did in ours. From each end of the line they set…
Astronomy
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