noon mark
Illustration — A noon mark on the facade of the Palace of the Dukes of Burgundy in Dijon The Noon mark is a type of sundial that at its simplest is a vertical line on a south facing wall or a north-south line on a horizontal pavement. When the shadow of a point (or a projected image of the Sun) crosses the line it will be midday. Noon in local standard time is defined as when the sun is overhead, however clocks and watches use mean time which varies from standard time by a few minutes each day.
noon mark
Bene16 · CC BY-SA 3.0
- Field
- sundial
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Illustration — A noon mark on the facade of the Palace of the Dukes of Burgundy in Dijon The Noon mark is a type of sundial that at its simplest is a vertical line on a south facing wall or a north-south line on a horizontal pavement. When the shadow of a point (or a projected image of the Sun) crosses the line it will be midday. Noon in local standard time is defined as when the sun is overhead, however clocks and watches use mean time which varies from standard time by a few minutes each day.
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wikidata · Q955484 · wikipedia · Noon mark
In this article
Overview
The difference is calculated using the equation of time and this can be shown on the noon mark by drawing an analemma, or using a correction table.
Dessin de la table d'une méridienne obtenu à partir du logiciel Shadows.
Aubry Gérard
Détermination de l'instant de l'équinoxe.
Aubry Gérard
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The Encyclopedia exists whether or not anything is for sale. Corrections are recorded rather than overwritten, and every version of this record is kept. Published 14 August 2026.
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