gnomon

Tanımlar (İngilizce)

1. isim An object such as a pillar or a rod that is used to tell time by the shadow it casts when the sun shines on it, especially the pointer on a sundial.

   “[T]he gnomon being the upright, and the shadow the side, the square-root of the sum of the squares is the hypotenuse; […]”

2. isim An object such as a pillar used by an observer to calculate the meridian altitude of the sun (that is, the altitude of the sun when it reaches the observer's meridian), for the purpose of determining the observer's latitude.

   “This muſt be performed by help of a Spherick Gnomon, (as Blaew [Willem Janszoon Blaeu] calls it,) which is a ſmall Pin or Needle fixed perpendicularly into a ſmal Baſis with an hollow concave bottom, that it may ſtand upon the convexity of the Globe.”

3. isim The index of the hour circle of a globe.

   “Index of a globe, the little style or gnomon, which being fixed on the pole of the globe, and turning round with it, points out the hours upon the hour circle.”

4. isim A plane figure formed by removing a parallelogram from a corner of a larger parallelogram.

   “If a Parallelogram be divided into four leſſer ones, by two Lines interſecting each other; and one of theſe Parallelograms be retrench'd, or taken away; the other three will make a Gnomon, ordinarily call'd a Square.”

5. isim A number representing the increment between two figurate numbers (“numbers equal to the numbers of dots in geometric figures formed of dots”).