The geography of the heavens, and class-book of astronomy: (1858)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868 · New York, Mason brothers · leaf 224
es in contact with theumbra, and the real eclipse begins. 455. In order to measure and record the extent of eclipses,the apparent diameters of the Sun and Moon are divided intotwelve equal parts, called digits; and in predicting eclipses,astronomers usually state which limb of the body is to…
Constellations · Stars
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