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Updated: May 31, 2025
AF is a gnomon at Alexandria; SB a gnomon at Svene; IS and JK represent the sun's rays.
"`He'll soon get well now, they said; and they went away full of hope and quite satisfied; but the monk, after he had given the patient some refreshing drink, went out into his garden among his trees, and then after walking about in the sunny walk under the old stone wall, he stopped by the mossy seat by the sun-dial, and stood looking down at the gnomon, whose shadow marked the hours, and sighed deeply as he thought how many times the shadow would point to noon before his poor patient was dead."
Anaximander invented the sphere, the gnomon, and geographical charts, which required considerable geometrical knowledge. Anaxagoras employed himself in prison in attempting to square the circle. Pythagoras discovered the important theorem that in a right-angled triangle the squares on the sides containing the right angle are together equal to the square on the opposite side of it.
In the afternoon watch the shadow of your gnomon as it lengthens, and when it once more touches the circumference of this circle and the shadow in the afternoon is equal in length to that of the morning, mark it with a point.
There were two sun-dials on different sides of the house, both the dial-plates of which were of stone; and on one the figures, so far as I could see, were quite worn off, but the gnomon still cast a shadow over it in such a way that I could judge that it was about noon. The other dial had some half-worn hour-marks, but no gnomon.
Hadley had invented the sextant, by which the sun's elevation could be taken with much more ease and accuracy than with the old cross-staff, the very rough gnomon which the earlier navigators had to use. Still more important for scientific geography was the improvement that had taken place in accurate chronometry.
They lingered one last moment by the sun-dial he had carved on a flat boulder, set in a little grassy lawn. The shadow of the gnomon fell athwart the IX and touched the inscription he had graved about the edge: I MARK NO HOURS BUT BRIGHT ONES. Beatrice pondered.
If it is found to be, as in Rome, equal to eight ninths of the gnomon, let a line be drawn on a plane surface, and in the middle thereof erect a perpendicular, plumb to the line, which perpendicular is called the gnomon.
The period of the equinoxes they determined by the help of a solitary pillar, or gnomon, placed in the centre of a circle, which was described in the area of the great temple, and traversed by a diameter that was drawn from east to west.
Wondering what kind of old woman presided over the treasures in this cave of Aladdin, I thought to make a first of my visits by going in and buying something. But I hesitated, because I could not think of anything I was in want of at least that the old woman was likely to have. To be sure I wanted a copy of Bengel's "Gnomon;" but she was not likely to have that.
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