All of these are believed to be nodus-type sundials, differing mainly in the surface that receives the shadow of the nodus.
12.
Some diptychs had rough calendars, in the form of pelekinons calibrated to a nodus in the form of a bead or knot on the string.
13.
In altitude dials, the time is read from where the nodus falls on a set of hour-curves that vary with the time of year.
14.
The " style " is the time-telling edge of the gnomon, though a single point or " nodus " may be used.
15.
An ancient variant of the equatorial sundial has only a nodus ( no style ) and the concentric circular hour-lines are arranged to resemble a spider-web.
16.
Nodus-based sundials may use a small hole or mirror to isolate a single ray of light; the former are sometimes called " aperture dials ".
17.
On any given day, the shadow of the nodus moves on a circle on the equatorial plane, and the radius of the circle measures the declination of the sun.
18.
Two editions of his work, " Nodus indissolubilis de conceptu mentis et conceptu ventris " ( Madrid, 1661, 1663 ), are on the Index of prohibited books.
19.
Horace writes " Nec deus intersit, nisi dignus vindice nodus " : " That a god not intervene, unless a knot show up that be worthy of such an untangler ".
20.
""'Ricinula nodus " "'is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.
