单词 | ellipticity |
例句 | “Perhaps, evolutionarily, birds stumbled upon this very natural, geometric solution, which is to increase the ellipticity and asymmetry of their eggs,” Dr. Mahadevan said, since doing so allows for greater volume without increasing girth. Why Do Bird Eggs Have Different Shapes? Look to the Wings 2017-06-22T04:00:00Z Latitude and time of year are chief, but the ellipticity of Earth’s orbit and the fact that the planet is not quite spherical must also be taken into account. Here a Henge, There a Henge: Astronomy Fun on a Street Near You 2012-07-10T22:15:02.217Z In the case of extensive operations the surface must be considered as a compressed ellipsoid of rotation, whose minor axis coincides with the earth’s axis, and whose compression, flattening, or ellipticity is about 1/298. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z The next advance was made by Kepler, who overthrew at one blow all the excentrics and epicycles of the ancients, when by his laborious calculations he proved the ellipticity of the orbit of Mars. Astronomical Myths Based on Flammarions's History of the Heavens 2011-06-24T02:00:15.873Z It arises from the ellipticity of the orbit, is zero at pericentre and apocentre, and reaches its greatest amount nearly midway between these points. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 7 "Equation" to "Ethics" 2011-02-27T03:00:31.973Z The extensive sets of observations of gravity provided the basis of calculations of the ellipticity of the earth. Development of Gravity Pendulums in the 19th Century Contributions from the Museum of History and Technology, Papers 34-44 On Science and Technology, Smithsonian Institution, 1966 2011-01-22T03:00:16.753Z COMPRESSION, in astronomy, the deviation of a heavenly body from the spherical form, called also the “ellipticity.” Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" In consequence of the slight ellipticity of its orbit, the Earth's distance from the sun varies to the extent of some 3,000,000 of miles. Essays: Scientific, Political, & Speculative, Vol. I Its ellipticity is conspicuous, the length of the longer axis being 78" and that of the shorter 60". Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers Its two diameters are to one another as 17 is to 16; the ellipticity of its disk is manifest to simple inspection. Pioneers of Science It follows from Clairaut’s theorem that if the earth is an oblate spheroid, its ellipticity can be determined from relative values of gravity and the absolute value at the equator involved in c. Development of Gravity Pendulums in the 19th Century Contributions from the Museum of History and Technology, Papers 34-44 On Science and Technology, Smithsonian Institution, 1966 2011-01-22T03:00:16.753Z Their ovalness or "ellipticity" is, however, in each case not by any means of the same degree. Astronomy of To-day A Popular Introduction in Non-Technical Language They were commenced by Tycho Brah�, and completed by Kepler, who made his calculations from Tycho’s observations, and based them upon his own great discovery of the ellipticity of the orbits of the planets. The Astronomy of Milton's 'Paradise Lost' The orbits of Mercury and Mars have an appearance of ellipticity because the sun does not occupy the central point in the diagram. To Mars via The Moon An Astronomical Story The ellipticity of Jupiter indicated by these figures is sufficiently marked to be obvious without any refined measures. The Story of the Heavens The form of our globe, which is that of an oblate spheroid with an ellipticity of about 1⁄299. The Sailor's Word-Book An Alphabetical Digest of Nautical Terms, including Some More Especially Military and Scientific, but Useful to Seamen; as well as Archaisms of Early Voyagers, etc. In some instances this ellipticity is so great as to take the bodies out into space to nearly six times the distance of Neptune from the sun. Astronomy of To-day A Popular Introduction in Non-Technical Language These Tables were calculated by Kepler from the Observations of Tycho, and are founded on his own great discovery of the ellipticity of the planetary orbits. The Martyrs of Science, or, The lives of Galileo, Tycho Brahe, and Kepler Further, Descartes was unable to give, or explain the ellipticity of the orbits of planets, and had to assume that there were elliptic vortices. Aether and Gravitation The pockets at least produced the good effect of toning down the marvellous ellipticity of his legs, and in doing this they performed a valuable service. The Ape, the Idiot & Other People When in the state of extreme ellipticity, the precession of the equinoxes will cause the hemispheres in turn each to have their winter and summer alternately near and far from the sun. Outlines of the Earth's History A Popular Study in Physiography To put it paradoxically, it is an ellipse which has no ellipticity, an oval without any ovalness! Astronomy of To-day A Popular Introduction in Non-Technical Language These two inequalities of very different magnitudes connected with the cause which produces them by analytical combinations of totally different kinds have, however, both conducted to the same value of the ellipticity. Biographies of Distinguished Scientific Men The fact that there is no measurable ellipticity is, I think, one which on first consideration would not be expected. The Birth-Time of the World and Other Scientific Essays They are really planets of wider wandering, greater ellipticity, and less density. Recreations in Astronomy With Directions for Practical Experiments and Telescopic Work When these were submitted to calculation, each led to the same value of the ellipticity. Library of the World's Best Literature, Ancient and Modern — Volume 2 This law, deduced, was the immediate path to the law of orbital ellipticity. The Atlantic Monthly, Volume 05, No. 30, April, 1860 As examples of astronomical explanation, we may take the well-known theory of Adhemar and Crohl, which is founded on changes in the ellipticity of the earth's orbit. The Antiquity of Man The specific mark of this family is the flattening or ellipticity. Darwin and Modern Science These, though they confirm the foregoing results, give a somewhat greater ellipticity to the earth than that found by the measurement of degrees. History of the Conflict Between Religion and Science The specific difference in the new family, denoted in the general sketch by b, is this ellipticity of the equator. Darwin and Modern Science |
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