Gnomon

Definition and stakes

Portrait of Vitruvius Vitruvius,  Ten Books on Architecture (1914)

“ In the very centre of that spot set up a bronze gnomon or "shadow tracker" (in Greek [Greek: skiathêras] ) . At about the fifth hour in the morning, take the end of the shadow cast by this gnomon, and mark it with a point. Then, opening your compasses to this point which marks the length of the gnomon's shadow, describe a circle from the centre. 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. ”
Source: Wikisource

George F. Chambers,  The Story of Eclipses

“ A gnomon had been set up in a low room and one of the missionaries, M. Le Comte, describes in the following words what they saw in connection with this gnomon:—“The aperture through which the rays of the Sun came was about 8 ft. above the floor; it is horizontal and formed of two pieces of copper, which may be turned so as to be farther from, or closer to, each other to enlarge or contract the aperture. Lower was a table with a brass plate in the middle on which was traced a meridian line 15 ft. long, divided by transverse lines which are neither finished nor exact. ”
Source: Gutenberg

Portrait of George MacDonald George MacDonald,  St. George and St. Michael

“ It mattered little, however, that only the stump of a gnomon was left, seeing the hedge around it had grown to such a height in relation to the diameter of the circle, that it was only for a very brief hour or so in the middle of a summer's day, when, of all periods, the passage of Time seems least to concern humanity, that it could have served to measure his march. The spot had, indeed, a time-forsaken look, as if it lay buried in the bosom of the past, and the present had forgotten it. ”
Source: Gutenberg

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