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Updated: May 27, 2025
That a circle may be square, or that parallel lines may enclose a space, are propositions the truth of which may be denied offhand. The ground of this is that the conception of squareness and circularity, of straight lines and an enclosed space are mutually destructive, they cancel each other.
AUTOLYCUS. A ring-plain 23 miles in diameter, deviating considerably from circularity, W. of Archimedes, on the Mare Imbrium, or rather on that part of it termed the Palus Putredinis. Its floor, which contains an inconspicuous central mountain, is depressed some 4000 feet below the surrounding country. With a power of 150 on a 4 5/8 achromatic, Dr.
AGRIPPA. A ring-plain 28 miles in diameter on the N. of the last, with a terraced border rising to a height of between 7000 and 8000 feet above the floor, which contains a large bright central mountain and two craters on the S. The shape of this formation deviates very considerably from circularity, the N. wall, on which stands a small crater, being almost lineal.
He held that the sea was only salt because of all the salt rivers that run into it. Considering that the salt rivers are themselves salted by passing through salt regions, or being fed by saline springs, all of which derive their saltness from deposits laid down long ago by evaporation from earlier seas or lake basins, this explanation savours somewhat of circularity.
Mercury was the one which least interested him; but he ascertained the perfect circularity of its disc. With respect to Venus, he endeavoured to determine the time of its rotation from 1777. We owe to him the discovery of the true shape of the "red planet Mars," that, like the Earth, it is an oblate spheroid, or flattened at the poles.
The trick, after all, is not quite so difficult as it looks. The robin gathers up a few sticks and places them as the beginning of the platform. More and more are brought and woven into each other, making a framework altogether too big for the nest. Then mud is brought and plastered inside of this. With the plastering of this mud the careful circularity of the work begins.
Strange, the law of circularity, after the lapse of two thousand years, brought round the same state of things in that storied spot. During the middle ages the Roman Forum was known only as the Campo Vaccino, the field of cattle.
Strange to say, the perfections of Spinoza, which appear so clear to him, are without any moral character whatever; and for men to speak of the justice of God, he tells us, is but to see in him a reflection of themselves; as if a triangle were to conceive of him as eminenter triangularis, or a circle to give him the property of circularity.
It exhibits a very marked departure from circularity, the outline of the border approximating in form to a hexagon with nearly straight sides. It includes an area of about 9000 square miles, the greatest distance from side to side being about 115 miles.
The circularity of Venus's orbit, and the consequently insignificant change in the sun's distance and heating effect, are other elements to be considered in estimating the singular constancy in the operation of natural agencies upon that interesting planet, which, twin of the earth though it be in stature, is evidently not its twin in temperament.
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