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Updated: May 22, 2025
Scheiner, at Potsdam in 1887. Their preliminary results, communicated to the Berlin Academy of Sciences, March 15, 1888, already showed that the requirements for effective research in this important branch were at last about to be complied with.
BLANCANUS. A formation, 50 miles in diameter, on the S.E. side of Clavius, whose surpassing beauties tend to render the less remarkable features of this magnificent ring-plain and those of its neighbour Scheiner less attractive than they otherwise would be. The crest of its finely terraced wall, which at one peak on the E. rises to 18,000 feet, is at least 12,000 feet above the interior.
Galileo announces his discoveries in Enigmas Discovers the Crescent of Venus the Ring of Saturn the Spots on the Sun Similar Observations made in England by Harriot Claims of Fabricius and Scheiner to the discovery of the Solar Spots Galileo's Letters to Velser on the claims of Scheiner His residence at the Villa of Salviati Composes his work on Floating Bodies, which involves him in new controversies.
Fabricii Phrysii de Maculis in Sole observatis, et apparente earum cum Sole conversione, Narratio. Wittemb. 1611. The claim of Scheiner, professor of mathematics at Ingolstadt, is more intimately connected with the history of Galileo. This learned astronomer having, early in 1611, turned his telescope to the sun, necessarily discovered the spots which at that time covered his disc.
SCHEINER. A still larger object, being nearly 70 miles in diameter, with a prominently terraced wall, fully as lofty as that of Blancanus. There is a large crater, nearly central, two others on the N.E. side of the floor, and a fourth at the inner foot of the E. wall. There is also a shallow ring on the N.E. slope.
Scheiner, who, many years afterwards, published an elaborate work on the subject, adopted the same idea which had at first occurred to Galileo that the spots were the dark sides of planets revolving round and near the sun.
Other astronomers announced the discovery of new satellites: Scheiner reckoned five, Rheita nine, and others found even so many as twelve: these satellites, however, were found to be only fixed stars.
And precisely this circulatory process it is which gives to our great luminary its permance as a sun, or warming and illuminating body. Both Galileo and Scheiner spoke of the apparent or "synodical" period, which is about one and a third days longer than the true or "sidereal" one. Am. Ass. Meteor. dell Osservatorio dell Coll. Roy. Jour. of Science, 1881, vol. xxi., p. 41.
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