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Updated: June 19, 2025
In Schiaparelli's first map they were represented as being much broader and less sharply defined than he himself and other observers found by later and equally favourable observations that they really were. Discovery of the Double Canals.
There was the work of getting the city's ancient reservoirs cleared of silt before the next spring thaw brought more water down the underground aqueducts everybody called canals in mistranslation of Schiaparelli's Italian word, though this was proving considerably easier than anticipated.
The reader may ask: "Why so readily accept Schiaparelli's conclusions with regard to Mercury while rejecting them in the case of Venus?" The reply is twofold. In the first place the markings on Venus, although Mr.
Some of them had been clearly perceived by De Ball at Bothkamp in 1882. Mr. Lowell followed Schiaparelli's example by observing Mercury in the full glare of noon.
The very fact of the difficulty of seeing any details on Mercury tended to prevent or delay corroboration of Schiaparelli's discovery. But there were two circumstances that contributed to the final acceptance of his results. One of these was his well-known experience as an observer and the high reputation that he enjoyed among astronomers, and the other was the development by Prof.
They amount in fact to only just one-thirtieth of those serving to modify the severe contrasts of climate in Mercury. Confirmatory evidence of Schiaparelli's result for Venus is not wanting.
At first the accuracy of Schiaparelli's observations was contested; it required a powerful telescope, and the most excellent ``seeing, to render the enigmatical lines visible at all, and many searchers were unable to detect them.
Schiaparelli's discovery, if it were received as correct, would put Mercury, as a planet, in a class by itself, and would distinguish it by a peculiarity which had always been recognized as a special feature of the moon, viz., that of rotating on its axis in the same period of time required to perform a revolution in its orbit, and, while this seemed natural enough for a satellite, almost nobody was prepared for the ascription of such eccentric conduct to a planet.
M. Perrotin at the Nice Observatory was able to redetect Schiaparelli's canals, which elicited the remark that "the reality of the existence of the delicate markings discovered by the keen-sighted astronomer of Brera seems thus fully demonstrated, and it appears highly probable that they vary in shape and distinctness with the changes of the Martial seasons."
Not very much can be said for Mercury as a telescopic object. The little planet presents phases like those of Venus, and, according to Schiaparelli and Lowell, it resembles Venus in its rotation, keeping always the same side to the sun. In fact, Schiaparelli's discovery of this peculiarity in the case of Mercury preceded the similar discovery in the case of Venus.
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