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lundi, 11 décembre 2017
Learn more about sundials
Article Index
Learn more about sundials
the different kinds of sundials
How to install and direct a sundial
Informations given by the sundial

The different kinds of sundials

The sundials can be of several types:

Sundials with polar-pointing gnomon

The sundials with polar-pointing gnomon are the most widespread dials. They are plane and have all their  gnomon (the physical structure of a sundial which casts the shadow) parallel to the axis that passes by the two poles. They can be placed on any plan, that it is vertical or not and with any orientation. One classifies these dials according to the orientation and the slope of the table of the dial (Vertical-Horizontal, Southerner, Westerner, Eastern or declining-polar or equatorial)

Analemmatic sundials

The analemmatic sundials are members of a dials family  whose gnomon is mobile according to the date in the year. An analemmatic sundial dial analemmatic consists of an ellipse graduated with time points, and a central line where the gnomon can be moved during the year .

The most current current analemmatic sundial is horizontal. It is often carried out on the ground, with large dimensions, so that a person can play the role of the gnomon, putting themselves at the location indicated by the date, by lifting his arm straight to cast its shadow on the ellipse.

Cylindric sundials

The cylindrical dials are plotted on their face internal or external, and the axis of the cylinder may have a varied inclination.

They are of three types: equatorial bows sundials (armillary dials), polar-semicircular sundials without gnomon and shepherd's dials.

Bifilar sundials

The time is indicated by the intersection on the dial plate, of the shadows of two wires (or other lines in space) stretched above and parallel to it.