ing shown the possibility of making a table of refraction corresponding to all apparent altitudes, we can now,by applying its effects to the observed altitudes of the cir-cumpolar stars, obtain the true latitude of the place of obser-vation. Let it be borne in mind, that the latitude of any place… … ASTRONOMICAL REFRACTION. 29 sent the earth. Fig. 4. Chap# iil Now, as an oh- ^>—i—^^ T^n- server always con- y^ ^\ stration. ceives himself to be on the topmost part of the earth, the vertical point, Z, truly and natu- h rally represents his zenith. Through E, draw HE 0, at right angles to E Z;…
Astronomy
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