Beobachtungen über die Sonnenfackeln und Sonnenflecken samt beylaeufigen Bemerkungen ueber die scheinbare Flaeche, Rotation und das Licht der Sonne.
Erfurt: Georg Adam Keyser, 1789. 4to (215 x 175 mm). 103 [1] pp., including woodcut headpiece and five folding engraved plates. Bound in contemporary sprinkled sheep, spine with 5 raised bands and some gilt ruling, gilt-decorated board edges (slightly rubbed, some creasing and wear to lower joints). Text generally bright..... More