Jacques Van den Bosch - Eeuwigduerenden Almanach - 1837
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A 19th‑century hand‑made perpetual almanac titled Eeuwigduerenden Almanach by Jacques Van den Bosch, dated 1837, in poor condition, measuring 33 cm by 23 cm with 68 pages of Dutch and French text and mixed binding.
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Unique manuscript of a handmade 19th-century "eternal almanac", a genre that goes back to the computus tradition, the popular calendar science in the Southern Netherlands/Flanders for calculating dates of holidays such as Easter, Pentecost; a hybrid of theology, astronomy and arithmetic. Used from the Middle Ages up to the 19th century.
The large title page ‘Eeuwigduerenden Almanach’ shows a table with sunrise and sunset times per month. Typical for this kind of almanacs because they also served as practical year-overviews. The central strip contains a series of small windows: Jaer, Paesschen, Sinxen, .... The associated dials that went with it are however missing. At the bottom the maker is listed: Jacques Van den Bosch, dated 26 February 1837. Possibly also the author of the accompanying manual.
Such calendars also included a mechanical part with revolving dials (volvelles). With these the user could compute the dates for Easter, Ash Wednesday, Pentecost, etc. for any year. In the manual there is only one still functional: "Het Wieltje", the dial that indicates the day of the week of the first day of each month. The other dials (Sunday letter, Solar circle, Golden Number, Epact) are still present as drawn/inscribed parts, but no longer rotatable.
The text section explains how to use the calendar and discusses various aspects of calendar calculation such as: definitions of time, day, month (synodic and sidereal lunar month), solar year, explanations and calculation examples for Sunday letter, Solar circle, Golden Number, Roman Indiction and Epact, a passage on the Gregorian calendar reform (Pope Gregory XIII, 1582), a fully worked example of the Easter date calculation for the year 1850. On the last page is a handwritten French text with operating instructions.
Title board: 33 x 23 cm. Text bundle (21 x 17 cm) with handwritten operating instructions and illustrations (67 p.). Highly soiled pages. 32 pages with text and drawings, plus blank pages. The first 12 pages with images of dials show strong signs of moisture damage. All together in a school folder (23 x 35 cm).
Unique manuscript of a handmade 19th-century "eternal almanac", a genre that goes back to the computus tradition, the popular calendar science in the Southern Netherlands/Flanders for calculating dates of holidays such as Easter, Pentecost; a hybrid of theology, astronomy and arithmetic. Used from the Middle Ages up to the 19th century.
The large title page ‘Eeuwigduerenden Almanach’ shows a table with sunrise and sunset times per month. Typical for this kind of almanacs because they also served as practical year-overviews. The central strip contains a series of small windows: Jaer, Paesschen, Sinxen, .... The associated dials that went with it are however missing. At the bottom the maker is listed: Jacques Van den Bosch, dated 26 February 1837. Possibly also the author of the accompanying manual.
Such calendars also included a mechanical part with revolving dials (volvelles). With these the user could compute the dates for Easter, Ash Wednesday, Pentecost, etc. for any year. In the manual there is only one still functional: "Het Wieltje", the dial that indicates the day of the week of the first day of each month. The other dials (Sunday letter, Solar circle, Golden Number, Epact) are still present as drawn/inscribed parts, but no longer rotatable.
The text section explains how to use the calendar and discusses various aspects of calendar calculation such as: definitions of time, day, month (synodic and sidereal lunar month), solar year, explanations and calculation examples for Sunday letter, Solar circle, Golden Number, Roman Indiction and Epact, a passage on the Gregorian calendar reform (Pope Gregory XIII, 1582), a fully worked example of the Easter date calculation for the year 1850. On the last page is a handwritten French text with operating instructions.
Title board: 33 x 23 cm. Text bundle (21 x 17 cm) with handwritten operating instructions and illustrations (67 p.). Highly soiled pages. 32 pages with text and drawings, plus blank pages. The first 12 pages with images of dials show strong signs of moisture damage. All together in a school folder (23 x 35 cm).
