Description
Geiger,F. Computus ecclesiasticus sive tractatus chronologicus in quo agitur de scientia observandi, calculandi aut supputandi solis & lunae motus... Item quomodo paranda & instruenda calendaria usui civili & politico servientia. Mannheim, J. Mayer 1731. 9 folding plates (with woodcut vellum), 1 text copperplate and 10 folding tables. 20 leaves, 383 pp. Central hardcover (edges damaged, worn and rubbed, waterstained). Houzeau/Lanc. 13961. de Backer/S. III, 1304, 5. only edition. - Extremely rare handbook for the calculation of the phases of the moon and sun according to the arithmetical method and on the basis of volvelles and tables. - The mathematician and theologian Friedrich Geiger (1655-1734) taught in Bamberg, among other places. - Waterstained in places, beginning and end somewhat spotty, footbridge with ink stain, plates and tables partly with losses, 2 tables with fold tears, scarcely trimmed. torn through. - Extremely rare manual for the calculation of lunar and solar phases by arithmetic method and based on volvelles and tables. Not in RBH, ABPC and JAP. Only a handful of copies in public libraries.
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