COPERNICUS CRATER AS SEEN BY J.A. GILLET AND W.J.ROLFE

JOSEPH ANTHONY GILLET ( 1837-1908)
WILLIAM JAMES ROLFE  (1827-1910)
Copernicus Crater (- 3800m / - 12467ft)
The Moon (Solar System)

In "Astronomy for the use of schools and academies", 1882,
Astronomical photography and ink
The Library of Congress

The site
Copernicus (- 3800m / - 12467ft) is a lunar impact crater located in eastern Oceanus Procellarum. It was named after the astronomer Nicolaus Copernicus (1473-1543). It typifies craters that formed during the Copernican period in that it has a prominent ray system. It may have been created by debris from the breakup of the parent body of asteroid 495 Eulalia 800 million years ago. Copernicus crater is visible using binoculars, and is located slightly northwest of the center of the Moon's Earth-facing hemisphere. South of the crater is the Mare Insularum, and to the south-south west is the crater Reinhold. North of Copernicus are the Montes Carpatus, which lie at the south edge of Mare Imbrium. West of Copernicus is a group of dispersed lunar hills. Due to its relative youth, the crater has remained in a relatively pristine shape since it formed.
The circular rim has a discernible hexagonal form, with a terraced inner wall and a 30 km wide, sloping rampart that descends nearly a kilometer to the surrounding mare. There are three distinct terraces visible, and arc-shaped landslides due to slumping of the inner wall as the crater debris subsided.
Most likely due to its recent formation, the crater floor has not been flooded by lava. The terrain along the bottom is hilly in the southern half while the north is relatively smooth. The central peaks consist of three isolated mountainous rises climbing as high as 1.2 km above the floor. These peaks are separated from each other by valleys, and they form a rough line along an east–west axis. Infrared observations of these peaks during the 1980s determined that they were primarily composed of the mafic form of olivine.
Copernicus H, a typical "dark-halo" crater, was a target of observation by Lunar Orbiter 5 in 1967. Dark-halo craters were once believed to be volcanic in origin rather than the result of impacts. The Orbiter image showed that the crater had blocks of ejecta like other craters of similar size, indicating an impact origin. The halo results from excavation of darker material (mare basalt) at depth. 

The author
William James Rolfe, Litt.D.was an American educator and Shakespearean scholar. Rolfe was born in Newburyport, Massachusetts. He attended Amherst College from 1845 through 1848, but left without graduating after three years due to financial hardship. Amherst, though, nonetheless later awarded him an honorary degree. Between 1852 and 1868, he served as headmaster of high schools at Dorchester, Lawrence, Salem, and Cambridge, Massachusetts. From 1882 to 1887, he served as president of Martha's Vineyard Summer Institute. Early in his career, he edited selections from Ovid and Virgil and (in collaboration) the Cambridge Course of Physics (six volumes, 1867–68). Rolfe's Shakespearean work began with an American edition of George Lillie Craik's English of Shakespeare (3rd revised ed., 1864, , which Crosby and Ainsworth published in 1867.This led to his preparation for Harper & Brothers of a complete edition of Shakespeare – the Friendly Edition (forty volumes, 1870–83; new edition, 1903–07). Rolfe's editions proved to be the best-selling versions in America (during a time of increased use of Shakespeare in high school classrooms) due both to his credentials as a high school administrator and to his use of Bowdlerization of the text in order to remove much of Shakespeare's lewd content. Rolfe also edited a complete edition of Tennyson (twelve volumes, 1898) and verse by many of the other great English poets. He wrote a very useful Satchel Guide to Europe, revised annually for 35 years, and at least five other books.

 
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