The geography of the heavens and classbook of astronomy; (1863)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868, Whitall, Henry, 1819-1887? Celestial planisphere. [from old catalog] · New York, Mason brothers; Boston, Mason & Hamlin; [etc., etc.] · leaf 223
P>- … Penumbra is from the Latin pene, almost, and umbra, a shadow. In this cut, theEarths umbra and penumbra will be readily found by the lettering ; while A is the umbra,and B B the penumbra, of the Mood. The latter is more broad than it should be, owingto the nearness of the Sun in the cut, as it…
Constellations · Stars
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Practical perspective; or, Perspective made easie. Teaching by the opticks, how to delineate all bodies, buildings, or landskips, &c. By the catoptricks, how to delineate confused appearances, so as when seen in a mirror or pollisht body of any intended shape, the reflection shall shew a designe. By the dioptircks [sic], how to draw parts of many figures into one, when seen through a glass or christal cut into many faces.. (1670)](https://img.insideoutlibrary.com/img/200/ia-practicalperspec00moxo-87-0.webp)
