Berry, Arthur,b. 1862 · London, J. Murray · leaf 85
Ch. il. times of year by quantities so small that they might fairlybe attributed to errors of observation. This problem was much more difficult than might at firstsight appear, on account of the great difficulty experiencedin Greek times and long afterwards in getting satisfactoryobservations of… … Fig. 17.—The eccentric. is possible, by measuring the length of the shadow cast bya rod at midday, to ascertain with fair accuracy the heightof the sun above the horizon, and hence to deduce itsdistance from the equator, or the declination (figs. 3, 14).This one quantity does not suffice to fix the…
Astronomy
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