BEOBACHTUNGEN ÜBER DIE SONNENFACKELN UND SONNENFLECKEN samt beylaeufigen Bemerkungen ueber die Scheinbare Flaeche, Rotation und das Licht der Sonne. Erfurt: G.A. Keyser,
1789. 4to, pp. 103, ; with five folding engraved plates; some occasional light foxing and soiling otherwise generally clean and crisp; finally gathering apparently printed on thicker paper stock; Uncommon first edition in book form of the author's well-illustrated and noted monograph on faculae and sunspots. The work was first read before the Academy of Sciences in Mainz in June 1788 and was also published in the academy’s Acta for 1788 and 1789. Schröter (1745-1816), established in Lilienthal one of the finest observatories in Europe, equipping it with the best instruments (all of which were paid for by George III). He was an active solar observer between 1785 and 1795, and his sunspot drawings were used by Rudolf Wolf in his own studies of sunspot and solar activity. "For thirty years the observatory at Lilienthal was a centre of astronomical research and was visited by foreign astronomers…Schröter was the first to observe the surface of the moon and the planets systematically over a long period. He made hundreds of drawings of lunar mountains and other features, and discovered and named the lunar rills."-D.S.B., XII, p. 226. His two volumes on Lunar topography reached levels of detail that were to remain for many years unsurpassed. OCLC locates copies at Chicago, Linda Hall, the Huntington, Harvard, Johns Hopkins, Columbia, NYPL, and Cambridge.
Condition: in contemporary full sprinkled sheep, spine in compartments with raised bands and ruled in gilt, both boards with some creasing and wear along lower joint, with some further minor scuffing, extremities and corners lightly bumped and worn; withdrawn from Hamilton College Library, Clinton, N.Y with their booklabel on front paste down and remains of further label on rear paste down, with unidentified armourial bookplate tipped on top and unidentified ownership signature on front free end paper; a good copy.