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Updated: May 28, 2025
The massing of clouds or mists will account for the peculiar whiteness at the edge of the limb, and an occasional veiling of the landscape." While he spoke, my attention was suddenly arrested by a vivid point of light which appeared on the dark side of the terminator, and south of the equator. "Hallo!" I exclaimed, involuntarily. "There's a light!"
"It is very nice," he told his nurse, "to see dear Madame Novikoff again, but I am going down hill fast, and cannot hope to be well enough to see much of her." This is in November, 1890; on New Year's Eve came the inexorable, "Terminator of delights and Separator of friends."
A fine crater-row runs round the outer slope of the E. wall, from the crater just mentioned to the N. side of the formation. It is best seen when the W. wall is on the evening terminator. There is also a broad valley on the S. prolongation of the W. wall. The central mountain is bright but not large. A cleft crosses the N.W. side of the floor.
The region should be observed when the E. longitude of the morning terminator is about 45 deg. SCHIAPARELLI. A conspicuous formation, about 16 miles in diameter, between Herodotus and the N.E. limb, with a border rising nearly 2000 feet above the Mare, and about 1000 more above the floor, on which Schmidt shows a central hill.
A few years ago M.E.L. Trouvelot of Meudon drew attention to a curious appearance which he noted in connection with certain rills when near the terminator, viz., extremely attenuated threads of light on their sites and their apparent prolongations.
From this crater a very remarkable cleft runs to the N. wall of Cardanus: it is bordered on either side by a bright bank, and cuts through the N.W. border of the latter formation. It is best seen when the E. wall of Cardanus is on the morning terminator. VASCO DE GAMA. A bright enclosure, 51 miles in diameter, with a small central mountain.
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.
Under a low angle of illumination the surface presents an extraordinarily rough aspect, well worthy of examination, but the dusky areas and the black spots can only be satisfactorily distinguished under a somewhat high sun. I have, however, seen them fairly well when the W. wall of Reinhold was on the morning terminator. It is hemmed in on every side by mountains.
Close under the N.W. wall is a small crater connected with it by a ridge, and E. of this a very rugged area, traversed in every direction by narrow shallow valleys, which are well worth looking at when close to the morning terminator. A bright spur projects from the N. wall of Lubiniezky.
Schröter's assertions to the same effect, though scouted with some unnecessary vehemence by Herschel, have since been repeatedly confirmed; amongst others by Mädler, De Vico, Langdon, who in 1873 saw the broken line of the terminator with peculiar distinctness through a veil of auroral cloud; by Denning, March 30, 1881, despite preliminary impressions to the contrary, as well as by C. V. Zenger at Prague, January 8, 1883.
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