Dissertazione intorno alle osservazioni solstiziali del 1775 allo gnomone della metropolitana fiorentina dell'abate Leonardo Ximenes ... del mese di agosto 1775.

Livorno: nella stamperia di Gio. Vincenzo Falorni, 1776.

1st Edition. Soft cover. 4to - over 9¾ - 12" tall. Very Good. Item #003295

4to (220 x 178 mm). [7], 4-126, [2] pp., large folding engraved plate bound at end, title-page with woodcut vignette. Signatures: [A]? (A1+?²) B-Q?. Bound in contemporary carta rustica, marbled edges, paper sticker with handwritten date "1784" to front cover (spine with tear and minor surface chipping, covers soiled and spotted, front flyleaf with old marginal paper repairs). Text little browned, occasional minor spotting and soiling, pages [7] and 4-6 with large brown spot (on first leaf with additional small hole). ----

Lalande 551; Riccardi II, 638. VERY RARE FIRST EDITION, variant including the 4 preliminary pages with dedication to Carlo conte di Firmian. This treatise describes the extremely careful observations of the summer solstice of 1775 made by Ximenes, Bernouilli, Fontana and Slop on the gnomon of Santa Maria del Fiore to verify the value obtained for the obliquity of the ecliptic. Its result of -35'' for the secular decrease in the ecliptic obliquity was retained by Lalande and is close to the modern value. See also: J. L. Heilbron, The Sun in the Church: Cathedrals as Solar Observatories, Harvard Univ. Press, 2009, pp.242-44.

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