The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 251
to the naked eye in ourlatitude ; but the illuminationof the twilight sky, and theexcess of vapor in our atmos-phere near the horizon, com-bine to make the telescopicstudy of the planet difficultI^g- =54- and unsatisfactory. 223. Tlic Atmosphere and Surface of Mercury. — Mer-cury seems to be… … ASTFONOMY. 229 surrounded by a border, as shown in Fig. 254. A brigjitspot has also been observed on the dark disk of the planetduring a transit, as shown in Fig. 255. The border aroundthe planet seems tobe due to the actionof the planets atmos-phere ; but it is dif-ficult to account forthe bright…
Astronomy
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