Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: May 14, 2025
It is shaped like the letter D, the straight side facing the W. There is a distinct crater on the N. wall. On the N.W. it is flanked by three irregular ring-plains, and on the S.E. by a fourth. Neison shows two small mountains on the floor, but Schmidt, whose drawing is very true to nature, has no detail whatever.
Schmidt shows the crater on the N. rim and another on the S.E. slope, both of which are omitted by Neison, though they are easy objects when Helicon is on the morning terminator. About 20 miles on the S.E. there is a very bright little crater on a faint light area. HELICON. The companion ring-plain on the E. It is 13 miles in diameter, and is very similar, though not quite so deep.
As an encouragement to amateur observers who may be disposed to find out for themselves whether or not changes now take place in the moon, the following sentence from the introduction to Professor Pickering's chapter on Plato in the Harvard Observatory Annals, volume xxxii, will prove useful and interesting: "In reviewing the history of selenography, one must be impressed by the singular fact that, while most of the astronomers who have made a special study of the moon, such as Schroeter, Maedler, Schmidt, Webb, Neison, and Elger, have all believed that its surface was still subject to changes readily visible from the earth, the great majority of astronomers who have paid little attention to the subject have quite as strenuously denied the existence of such changes."
Two or more low ridges, traversing the floor from N. to S., and a small crater, are, however, clearly visible under oblique illumination. Schmidt draws a crater-rill, and Neison two parallel rills on the floor, the former extends in a southerly direction to the W. side of Le Monnier. DANIELL. A bright little ring-plain N. of Posidonius.
William Fair, the chief and master-spirit of the Registry-Office, and the highest authority in vital statistics, Colonel Sir Alexander Tulloch, author of the elaborate and valuable reports on the mortality in the British army, Francis G. P. Neison, author of "Contributions to Vital Statistics," Miss Nightingale, and others, surgeons, officers, purveyors, engineers, soldiers, and medical and sanitary scholars.
Neison refers to two long straight streaks extending from Crozier towards Messier. BELLOT. A brilliant little ring-plain N.E. of Crozier. There is a small circular depression on the S. border, and a prominent crater on the W. side of the dark interior. On the S.S.E. is the curiously shaped enclosure Cook d, with very bright broad lofty walls and a fine central mountain.
It has a peak on its W. rim considerably loftier than the rest of the wall, which is visible as a brilliant spot at sunrise long before the rest of the rampart is illuminated. On the S. there are two bright longitudinal ridges ranging from N.E. to S.W. These stand in the position where Neison draws two straight clefts.
On the W. there is an irregular inconspicuous enclosure, whose contiguity has apparently modified the shape of the border. CUVIER. A walled-plain, about 50 miles in diameter, on the S.E. of Clairaut. The border on the E. rises to 12,000 feet; and on the N.W. is much broken by depressions. Neison has seen a mound, with a minute crater W. of it, on the otherwise undisturbed interior.
LICETUS. An irregular formation, about 50 miles in maximum width, on the S. of Stofler, with the flanks of which it is connected by a coarse valley. Neison points out that it consists of a group of ring-plains united into one, owing to the separating walls having been partially destroyed. This seems to be clearly the case, if Licetus is examined under a low sun.
The position of this object in Schmidt's chart is not accordant with its place in Beer and Madler's map, nor in that of Neison. HAHN. A ring-plain, 46 miles in diameter, with a fine central mountain and lofty peaks on the border, which is not continuous on the S. There is a large and prominent crater on the E.
Word Of The Day
Others Looking