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If inequalities of surface are in question, they must be on a considerable scale; and a similar explanation might be given of the deformations of the "terminator" or dividing-line between darkness and light in the planet's phases first remarked by Schröter, and again clearly seen by Trouvelot in 1878 and 1881.
The great Alpine valley, though first described by Schroter, is said to have been discovered on September 22, 1727, by Bianchini, but it is very unlikely that an object which is so prominent when near the terminator was not often remarked before this.
Apropos of the great sonata above mentioned, with which the Clementi furore began in London, it is said that John Christian Bach, son of Sebastian, one of the greatest executants of the time, confessed his inability to do it justice, and Schrôter, one of those sharing the honor of the invention of the piano-forte, and a leading musician of his age, said, "Only the devil and Clementi could play it."
Still farther S., there is another bright deep crater, a, with a large low ring adjoining it on the S., abutting on the S.E. border of the Mare. Schroter bestowed much attention on these and other formations on the Mare Crisium, and attributed certain changes which he observed to a lunar atmosphere. PEIRCE. This formation, smaller than Picard, is also prominent, its border being very bright.
Schröter, on the other hand, went altogether wide of the truth as regards Mars. He held that the surface visible to us is a mere shell of drifting cloud, deriving a certain amount of apparent stability from the influence on evaporation and condensation of subjacent but unseen areographical features; and his opinion prevailed with his contemporaries.
We may accept 1/618000 of Zöllner as sufficiently close; so that it would require 600,000 full moons to give the same amount of light as that of the sun. Schroter, however, came to the conclusion that the moon has an atmosphere. A chart of the moon's surface, with the names of the principal physical features, will be found in Ball's Story of the Heavens, 2nd edit., p. 60.
On March 26, 1800, Schröter, observing with his 13-foot reflector in a peculiarly clear sky, perceived the southern horn of Mercury's crescent to be quite distinctly blunted. Interception of sunlight by a Mercurian mountain rather more than eleven English miles high explained the effect to his satisfaction.
While these men openly and consciously belonged to a world doomed to destruction, and all their actions and escapades could only be explained by the hypothesis that they all believed that inevitable ruin was imminent, I made in their company the acquaintance of a certain Schroter, who particularly attracted me by his cordial disposition, pleasant Hanoverian accent, and refined wit.
The great cleft, extending from the central mountains to the S.E. wall, and perhaps beyond, was discovered by Schroter on September 16, 1788, and can be seen in a 2 inch achromatic. In larger instruments it is found to be in places bordered by raised banks.
SCHROTER. A somewhat larger formation, with a border wanting on the S. Schmidt draws a considerable crater on the S.W. side of the floor.
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