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Spheroid

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2171: 2081: 202: 768: 2957: 29: 1732: 2512: 2236:. The major axis of the prolate spheroid does not run through the satellite's poles in this case, but through the two points on its equator directly facing toward and away from the primary. This combines with the smaller oblate distortion from the synchronous rotation to cause the body to become triaxial. 2017:
All modern geodetic ellipsoids are defined by the semi-major axis plus either the semi-minor axis (giving the aspect ratio), the flattening, or the first eccentricity. While these definitions are mathematically interchangeable, real-world calculations must lose some precision. To avoid confusion, an
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originally meant "an approximately spherical body", admitting irregularities even beyond the bi- or tri-axial ellipsoidal shape; that is how the term is used in some older papers on geodesy (for example, referring to truncated spherical harmonic expansions of the
1505: 1520: 2324: 2012: 763:{\displaystyle S_{\text{oblate}}=2\pi a^{2}\left(1+{\frac {1-e^{2}}{e}}\operatorname {arctanh} e\right)=2\pi a^{2}+\pi {\frac {c^{2}}{e}}\ln \left({\frac {1+e}{1-e}}\right)\qquad {\mbox{where}}\quad e^{2}=1-{\frac {c^{2}}{a^{2}}}.} 343: 816: 456: 999:
and can no longer directly be identified with the eccentricity. Both of these results may be cast into many other forms using standard mathematical identities and relations between parameters of the ellipse.
2251:, used to analyze wave propagation and interference in space, are a series of concentric prolate spheroids with principal axes aligned along the direct line-of-sight between a transmitter and a receiver. 1166: 1076: 1908: 1839: 2329: 1924: 1188: 2579: 1376: 1727:{\displaystyle H(\beta ,\lambda )={\frac {c\left(2a^{2}+\left(c^{2}-a^{2}\right)\cos ^{2}\beta \right)}{2a\left(a^{2}+\left(c^{2}-a^{2}\right)\cos ^{2}\beta \right)^{\frac {3}{2}}}}.} 2507:{\displaystyle {\begin{aligned}A=B&={\tfrac {1}{5}}M\left(a^{2}+c^{2}\right),\\C&={\tfrac {1}{5}}M\left(a^{2}+b^{2}\right)={\tfrac {2}{5}}M\left(a^{2}\right),\end{aligned}}} 1919: 247: 2975: 945:{\displaystyle S_{\text{prolate}}=2\pi a^{2}\left(1+{\frac {c}{ae}}\arcsin \,e\right)\qquad {\mbox{where}}\quad e^{2}=1-{\frac {a^{2}}{c^{2}}}.} 372: 2224:
In contrast to being distorted into oblate spheroids via rapid rotation, celestial objects distort slightly into prolate spheroids via
2882: 2665: 1107: 1014: 2796: 2620: 2651: 1287:{\displaystyle {\boldsymbol {\sigma }}(\beta ,\lambda )=(a\cos \beta \cos \lambda ,a\cos \beta \sin \lambda ,c\sin \beta ),} 2610: 1856: 1781: 2271: 2527: 1845: 1500:{\displaystyle K(\beta ,\lambda )={\frac {c^{2}}{\left(a^{2}+\left(c^{2}-a^{2}\right)\cos ^{2}\beta \right)^{2}}},} 972: 790: 2318:. However, in a spheroid the minor axes are symmetrical. Therefore, our inertial terms along the major axes are: 2034:, prolate, and oblate spheroidal, where the polar axis is assumed to be the spin axis (or direction of the spin 106: 2295:
is that of an ellipsoid with an additional axis of symmetry. Given a description of a spheroid as having a
2232:, which becomes slightly more or less prolate in its orbit due to a slight eccentricity, causing intense 2039: 167: 139: 69: 65: 2961: 2898: 2824: 2135: 2125: 2851: 2903: 2630: 2159: 2101: 2050: 2007:{\displaystyle {\begin{aligned}e&={\sqrt {2f-f^{2}}}\\f&=1-{\sqrt {1-e^{2}}}\end{aligned}}} 1307: 1177: 163: 143: 2727: 2765: 2757: 2194: 2147: 2061: 1367: 190: 187: 1850:(usually simply eccentricity, as above) is often used instead of flattening. It is defined by: 2998: 2993: 2878: 2868: 2792: 2661: 2657: 2292: 2170: 2155: 2069: 2047: 175: 85: 1737:
Both of these curvatures are always positive, so that every point on a spheroid is elliptic.
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is similar but has a pointier end than a spheroid could. If the ellipse is rotated about its
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when they orbit a massive body in a close orbit. The most extreme example is Jupiter's moon
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The prolate spheroid is the approximate shape of the ball in several sports, such as in the
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is the distance from centre to pole along the symmetry axis. There are two possible cases:
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can be used to calculate the surface area of a prolate spheroid and vice versa. However,
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elements are shaped like prolate spheroids. In anatomy, near-spheroid organs such as
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of the Solar System approximate prolate spheroids in shape, though they are actually
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model uses a spheroid whose radius is 6,378.137 km (3,963.191 mi) at the
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The most common shapes for the density distribution of protons and neutrons in an
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ellipsoidal definition considers its own values to be exact in the form it gives.
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Greenburg, John L. (1995). "Isaac Newton and the Problem of the Earth's Shape".
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vector). Deformed nuclear shapes occur as a result of the competition between
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The equation of a tri-axial ellipsoid centred at the origin with semi-axes
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Many submarines have a shape which can be described as prolate spheroid.
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the Earth is often approximated by an oblate spheroid, known as the
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Introduction à la Géodésie et au geopositionnement par satellites
2158:. Earth's diverse cartographic and geodetic systems are based on 2615: 2225: 2150:'s theories for their interpretation, reasoned that Jupiter and 2968: 2815:(October 1973), "The Distance to the Crab Nebula and NP 0532", 982:
These formulas are identical in the sense that the formula for
2899:"What Do a Submarine, a Rocket and a Football Have in Common?" 154:
in the direction of its axis of rotation. For that reason, in
1761:, is the ratio of the polar to equatorial lengths, while the 1161:{\displaystyle {\tfrac {\pi }{6}}A^{2}C\approx 0.523A^{2}C.} 1071:{\displaystyle {\tfrac {4}{3}}\pi a^{2}c\approx 4.19a^{2}c.} 205:
The assignment of semi-axes on a spheroid. It is oblate if
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The oblate spheroid is the approximate shape of rotating
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The prolate spheroid is generated by rotation about the
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Publications of the Astronomical Society of the Pacific
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The relations between eccentricity and flattening are:
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The oblate spheroid is generated by rotation about the
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The term is also used to describe the shape of some
1903:{\displaystyle e={\sqrt {1-{\frac {c^{2}}{a^{2}}}}}} 1834:{\displaystyle f={\frac {a-c}{a}}=1-{\frac {c}{a}}.} 76:
about one of its principal axes; in other words, an
2784: 2573: 2506: 2006: 1902: 1833: 1726: 1499: 1286: 1160: 1070: 944: 762: 450: 337: 2574:{\displaystyle M={\tfrac {4}{3}}\pi a^{2}c\rho .} 174:and 6,356.752 km (3,949.903 mi) at the 150:) is not quite a sphere, but instead is slightly 2787:The Story of Civilization: The Age of Louis XIV 1008:The volume inside a spheroid (of any kind) is 465:is the equatorial radius of the spheroid, and 2072:is also a shape of archaeological artifacts. 2060:. Rotating equilibrium spheroids include the 1178:Radius of the Earth § Radii of curvature 8: 2783:Durant, Will; Durant, Ariel (28 July 1997). 2703:A derivation of this result may be found at 2680:A derivation of this result may be found at 2706:"Prolate Spheroid - from Wolfram MathWorld" 2291:For a spheroid having uniform density, the 2683:"Oblate Spheroid - from Wolfram MathWorld" 2116:. Saturn is the most oblate planet in the 2836: 2556: 2537: 2529: 2487: 2464: 2450: 2437: 2413: 2385: 2372: 2348: 2328: 2326: 1992: 1980: 1952: 1937: 1923: 1921: 1890: 1880: 1874: 1866: 1858: 1818: 1791: 1783: 1707: 1690: 1675: 1662: 1644: 1609: 1594: 1581: 1563: 1545: 1522: 1486: 1469: 1454: 1441: 1423: 1407: 1401: 1378: 1192: 1190: 1146: 1127: 1111: 1109: 1056: 1037: 1018: 1016: 959:-axis of an ellipse with semi-major axis 931: 921: 915: 900: 888: 878: 860: 843: 824: 818: 777:-axis of an ellipse with semi-major axis 749: 739: 733: 718: 706: 675: 654: 648: 636: 597: 584: 567: 548: 542: 434: 424: 418: 407: 396: 383: 376: 374: 321: 311: 305: 294: 284: 278: 267: 257: 251: 249: 2877:(6 ed.). Elsevier Health Sciences. 2875:Introduction to Vascular Ultrasonography 200: 22:Spheroids with vertical rotational axes 2873:John Pellerito, Joseph F Polak (2012). 2708:. Mathworld.wolfram.com. 7 October 2003 2642: 1193: 2287:Ellipsoid § Dynamical properties 1101:is the polar diameter, the volume is 241:aligned along the coordinate axes is 35: 16:Surface formed by rotating an ellipse 7: 2154:are oblate spheroids owing to their 91:If the ellipse is rotated about its 2521:is the mass of the body defined as 2088:is a slight oblate spheroid with a 1182:Let a spheroid be parameterized as 166:, instead of a sphere. The current 2852:"Nuclear fission - Fission theory" 14: 2932:MathWorld--A Wolfram Web Resource 2955: 2112:, and the quickly spinning star 1091:is the equatorial diameter, and 348:The equation of a spheroid with 27: 1751:of an oblate spheroid/ellipse, 971:may again be identified as the 895: 887: 713: 705: 134:Due to the combined effects of 2621:Prolate spheroidal coordinates 1539: 1527: 1395: 1383: 1278: 1215: 1209: 1197: 1: 2611:Oblate spheroidal coordinates 2726:Brial P., Shaalan C.(2009), 2146:'s pendulum experiments and 2162:, all of which are oblate. 2042:repulsion between protons, 2022:Occurrence and applications 3015: 2284: 1175: 2742:History of Exact Sciences 2270:may be measured by their 789:may be identified as the 26: 2813:Trimble, Virginia Louise 2748:(4). Springer: 371–391. 2650:Torge, Wolfgang (2001). 2056:Spheroids are common in 800:A prolate spheroid with 521:An oblate spheroid with 2976:Encyclopædia Britannica 2856:Encyclopedia Britannica 2685:. Mathworld.wolfram.com 1366:. Then, the spheroid's 55:ellipsoid of revolution 2979:(11th ed.). 1911. 2575: 2508: 2179: 2093: 2008: 1904: 1835: 1728: 1501: 1288: 1162: 1072: 946: 764: 452: 339: 226: 215:(left) and prolate if 2576: 2509: 2173: 2083: 2009: 1905: 1836: 1729: 1502: 1289: 1163: 1073: 947: 765: 508:reduces to a sphere. 453: 340: 204: 168:World Geodetic System 2964:at Wikimedia Commons 2528: 2325: 2281:Dynamical properties 2160:reference ellipsoids 2126:planetary flattening 1920: 1857: 1782: 1521: 1377: 1189: 1108: 1015: 963:and semi-minor axis 817: 781:and semi-minor axis 541: 373: 356:is given by setting 248: 59:rotational ellipsoid 2926:Weisstein, Eric W. 2904:Scientific American 2829:1973PASP...85..579T 2631:Translation of axes 2272:long and short axes 2195:triaxial ellipsoids 2104:, including Earth, 1308:parametric latitude 164:reference ellipsoid 144:figure of the Earth 119:, flattened like a 113:, the result is an 101:, elongated like a 53:, also known as an 23: 2754:10.1007/BF00374704 2571: 2547: 2504: 2502: 2474: 2423: 2358: 2180: 2148:Christiaan Huygens 2094: 2062:Maclaurin spheroid 2004: 2002: 1900: 1831: 1724: 1497: 1368:Gaussian curvature 1284: 1158: 1121: 1068: 1028: 942: 893: 760: 711: 494:: prolate spheroid 448: 335: 227: 191:geopotential model 95:, the result is a 21: 2960:Media related to 2907:. 8 November 2010 2658:Walter de Gruyter 2546: 2473: 2422: 2357: 2302:, and minor axes 2293:moment of inertia 2166:Prolate spheroids 2156:centrifugal force 1998: 1958: 1898: 1896: 1826: 1807: 1719: 1715: 1492: 1120: 1027: 937: 892: 873: 827: 810:has surface area 755: 710: 699: 663: 607: 551: 482:: oblate spheroid 440: 413: 327: 300: 273: 107:American football 86:circular symmetry 84:. A spheroid has 47: 46: 3006: 2980: 2972: 2970:"Spheroid"  2959: 2943: 2942: 2940: 2938: 2923: 2917: 2916: 2914: 2912: 2895: 2889: 2888: 2866: 2860: 2859: 2848: 2842: 2841: 2840: 2809: 2803: 2802: 2790: 2780: 2774: 2773: 2737: 2731: 2724: 2718: 2717: 2715: 2713: 2701: 2695: 2694: 2692: 2690: 2678: 2672: 2671: 2656:(3rd ed.). 2647: 2626:Rotation of axes 2596:Equatorial bulge 2591:Ellipsoidal dome 2580: 2578: 2577: 2572: 2561: 2560: 2548: 2539: 2520: 2513: 2511: 2510: 2505: 2503: 2496: 2492: 2491: 2475: 2466: 2460: 2456: 2455: 2454: 2442: 2441: 2424: 2415: 2395: 2391: 2390: 2389: 2377: 2376: 2359: 2350: 2317: 2313: 2309: 2305: 2301: 2130:equatorial bulge 2124:of 0.09796. See 2102:celestial bodies 2076:Oblate spheroids 2066:Jacobi ellipsoid 2058:3D cell cultures 2036:angular momentum 2013: 2011: 2010: 2005: 2003: 1999: 1997: 1996: 1981: 1959: 1957: 1956: 1938: 1909: 1907: 1906: 1901: 1899: 1897: 1895: 1894: 1885: 1884: 1875: 1867: 1840: 1838: 1837: 1832: 1827: 1819: 1808: 1803: 1792: 1774: 1760: 1733: 1731: 1730: 1725: 1720: 1718: 1717: 1716: 1708: 1706: 1702: 1695: 1694: 1685: 1681: 1680: 1679: 1667: 1666: 1649: 1648: 1626: 1625: 1621: 1614: 1613: 1604: 1600: 1599: 1598: 1586: 1585: 1568: 1567: 1546: 1506: 1504: 1503: 1498: 1493: 1491: 1490: 1485: 1481: 1474: 1473: 1464: 1460: 1459: 1458: 1446: 1445: 1428: 1427: 1412: 1411: 1402: 1365: 1357: 1356: 1354: 1353: 1350: 1347: 1336: 1334: 1333: 1330: 1327: 1314: 1303:reduced latitude 1300: 1293: 1291: 1290: 1285: 1196: 1167: 1165: 1164: 1159: 1151: 1150: 1132: 1131: 1122: 1113: 1100: 1090: 1077: 1075: 1074: 1069: 1061: 1060: 1042: 1041: 1029: 1020: 994: 990: 970: 966: 962: 958: 951: 949: 948: 943: 938: 936: 935: 926: 925: 916: 905: 904: 894: 890: 886: 882: 874: 872: 861: 848: 847: 829: 828: 825: 809: 788: 784: 780: 776: 769: 767: 766: 761: 756: 754: 753: 744: 743: 734: 723: 722: 712: 708: 704: 700: 698: 687: 676: 664: 659: 658: 649: 641: 640: 622: 618: 608: 603: 602: 601: 585: 572: 571: 553: 552: 549: 530: 507: 493: 481: 468: 464: 457: 455: 454: 449: 441: 439: 438: 429: 428: 419: 414: 412: 411: 402: 401: 400: 388: 387: 377: 365: 351: 344: 342: 341: 336: 328: 326: 325: 316: 315: 306: 301: 299: 298: 289: 288: 279: 274: 272: 271: 262: 261: 252: 240: 236: 232: 224: 214: 98:prolate spheroid 31: 24: 3014: 3013: 3009: 3008: 3007: 3005: 3004: 3003: 2984: 2983: 2967: 2952: 2947: 2946: 2936: 2934: 2925: 2924: 2920: 2910: 2908: 2897: 2896: 2892: 2885: 2872: 2867: 2863: 2850: 2849: 2845: 2811: 2810: 2806: 2799: 2782: 2781: 2777: 2739: 2738: 2734: 2725: 2721: 2711: 2709: 2704: 2702: 2698: 2688: 2686: 2681: 2679: 2675: 2668: 2660:. p. 104. 2649: 2648: 2644: 2639: 2587: 2552: 2526: 2525: 2518: 2501: 2500: 2483: 2479: 2446: 2433: 2432: 2428: 2406: 2400: 2399: 2381: 2368: 2367: 2363: 2341: 2323: 2322: 2315: 2311: 2307: 2303: 2299: 2289: 2283: 2197:. Examples are 2168: 2142:, working from 2078: 2044:surface tension 2040:electromagnetic 2024: 2001: 2000: 1988: 1967: 1961: 1960: 1948: 1930: 1918: 1917: 1886: 1876: 1855: 1854: 1793: 1780: 1779: 1772: 1752: 1743: 1686: 1671: 1658: 1657: 1653: 1640: 1639: 1635: 1634: 1627: 1605: 1590: 1577: 1576: 1572: 1559: 1555: 1551: 1547: 1519: 1518: 1465: 1450: 1437: 1436: 1432: 1419: 1418: 1414: 1413: 1403: 1375: 1374: 1359: 1351: 1348: 1345: 1344: 1342: 1331: 1328: 1325: 1324: 1322: 1320: 1312: 1298: 1187: 1186: 1180: 1174: 1142: 1123: 1106: 1105: 1092: 1082: 1052: 1033: 1013: 1012: 1006: 992: 989: 983: 968: 964: 960: 956: 927: 917: 896: 865: 853: 849: 839: 820: 815: 814: 801: 786: 782: 778: 774: 745: 735: 714: 688: 677: 671: 650: 632: 593: 586: 577: 573: 563: 544: 539: 538: 522: 519: 514: 499: 485: 473: 466: 462: 430: 420: 403: 392: 379: 378: 371: 370: 357: 349: 317: 307: 290: 280: 263: 253: 246: 245: 238: 234: 230: 216: 206: 199: 188:Earth's gravity 116:oblate spheroid 80:with two equal 17: 12: 11: 5: 3012: 3010: 3002: 3001: 2996: 2986: 2985: 2982: 2981: 2965: 2951: 2950:External links 2948: 2945: 2944: 2918: 2890: 2883: 2861: 2843: 2838:10.1086/129507 2804: 2797: 2775: 2732: 2719: 2696: 2673: 2666: 2641: 2640: 2638: 2635: 2634: 2633: 2628: 2623: 2618: 2613: 2608: 2603: 2598: 2593: 2586: 2583: 2582: 2581: 2570: 2567: 2564: 2559: 2555: 2551: 2545: 2542: 2536: 2533: 2515: 2514: 2499: 2495: 2490: 2486: 2482: 2478: 2472: 2469: 2463: 2459: 2453: 2449: 2445: 2440: 2436: 2431: 2427: 2421: 2418: 2412: 2409: 2407: 2405: 2402: 2401: 2398: 2394: 2388: 2384: 2380: 2375: 2371: 2366: 2362: 2356: 2353: 2347: 2344: 2342: 2340: 2337: 2334: 2331: 2330: 2282: 2279: 2201:'s satellites 2167: 2164: 2077: 2074: 2028:atomic nucleus 2023: 2020: 2015: 2014: 1995: 1991: 1987: 1984: 1979: 1976: 1973: 1970: 1968: 1966: 1963: 1962: 1955: 1951: 1947: 1944: 1941: 1936: 1933: 1931: 1929: 1926: 1925: 1911: 1910: 1893: 1889: 1883: 1879: 1873: 1870: 1865: 1862: 1842: 1841: 1830: 1825: 1822: 1817: 1814: 1811: 1806: 1802: 1799: 1796: 1790: 1787: 1742: 1739: 1735: 1734: 1723: 1714: 1711: 1705: 1701: 1698: 1693: 1689: 1684: 1678: 1674: 1670: 1665: 1661: 1656: 1652: 1647: 1643: 1638: 1633: 1630: 1624: 1620: 1617: 1612: 1608: 1603: 1597: 1593: 1589: 1584: 1580: 1575: 1571: 1566: 1562: 1558: 1554: 1550: 1544: 1541: 1538: 1535: 1532: 1529: 1526: 1512:mean curvature 1508: 1507: 1496: 1489: 1484: 1480: 1477: 1472: 1468: 1463: 1457: 1453: 1449: 1444: 1440: 1435: 1431: 1426: 1422: 1417: 1410: 1406: 1400: 1397: 1394: 1391: 1388: 1385: 1382: 1295: 1294: 1283: 1280: 1277: 1274: 1271: 1268: 1265: 1262: 1259: 1256: 1253: 1250: 1247: 1244: 1241: 1238: 1235: 1232: 1229: 1226: 1223: 1220: 1217: 1214: 1211: 1208: 1205: 1202: 1199: 1195: 1173: 1170: 1169: 1168: 1157: 1154: 1149: 1145: 1141: 1138: 1135: 1130: 1126: 1119: 1116: 1079: 1078: 1067: 1064: 1059: 1055: 1051: 1048: 1045: 1040: 1036: 1032: 1026: 1023: 1005: 1002: 987: 953: 952: 941: 934: 930: 924: 920: 914: 911: 908: 903: 899: 885: 881: 877: 871: 868: 864: 859: 856: 852: 846: 842: 838: 835: 832: 823: 771: 770: 759: 752: 748: 742: 738: 732: 729: 726: 721: 717: 703: 697: 694: 691: 686: 683: 680: 674: 670: 667: 662: 657: 653: 647: 644: 639: 635: 631: 628: 625: 621: 617: 614: 611: 606: 600: 596: 592: 589: 583: 580: 576: 570: 566: 562: 559: 556: 547: 518: 515: 513: 510: 496: 495: 483: 461:The semi-axis 459: 458: 447: 444: 437: 433: 427: 423: 417: 410: 406: 399: 395: 391: 386: 382: 346: 345: 334: 331: 324: 320: 314: 310: 304: 297: 293: 287: 283: 277: 270: 266: 260: 256: 198: 195: 82:semi-diameters 45: 44: 39: 33: 32: 15: 13: 10: 9: 6: 4: 3: 2: 3011: 3000: 2997: 2995: 2992: 2991: 2989: 2978: 2977: 2971: 2966: 2963: 2958: 2954: 2953: 2949: 2933: 2929: 2922: 2919: 2906: 2905: 2900: 2894: 2891: 2886: 2884:9781455737666 2880: 2876: 2870: 2865: 2862: 2857: 2853: 2847: 2844: 2839: 2834: 2830: 2826: 2822: 2818: 2814: 2808: 2805: 2800: 2794: 2791:. MJF Books. 2789: 2788: 2779: 2776: 2771: 2767: 2763: 2759: 2755: 2751: 2747: 2743: 2736: 2733: 2729: 2723: 2720: 2707: 2700: 2697: 2684: 2677: 2674: 2669: 2667:9783110170726 2663: 2659: 2655: 2654: 2646: 2643: 2636: 2632: 2629: 2627: 2624: 2622: 2619: 2617: 2614: 2612: 2609: 2607: 2604: 2602: 2601:Great ellipse 2599: 2597: 2594: 2592: 2589: 2588: 2584: 2568: 2565: 2562: 2557: 2553: 2549: 2543: 2540: 2534: 2531: 2524: 2523: 2522: 2497: 2493: 2488: 2484: 2480: 2476: 2470: 2467: 2461: 2457: 2451: 2447: 2443: 2438: 2434: 2429: 2425: 2419: 2416: 2410: 2408: 2403: 2396: 2392: 2386: 2382: 2378: 2373: 2369: 2364: 2360: 2354: 2351: 2345: 2343: 2338: 2335: 2332: 2321: 2320: 2319: 2298: 2294: 2288: 2280: 2278: 2275: 2273: 2269: 2265: 2261: 2257: 2256:atomic nuclei 2252: 2250: 2249:Fresnel zones 2246: 2242: 2237: 2235: 2231: 2227: 2222: 2220: 2216: 2212: 2208: 2204: 2200: 2196: 2192: 2187: 2185: 2177: 2172: 2165: 2163: 2161: 2157: 2153: 2149: 2145: 2141: 2137: 2136:Enlightenment 2133: 2132:for details. 2131: 2127: 2123: 2119: 2115: 2111: 2107: 2103: 2099: 2091: 2087: 2082: 2075: 2073: 2071: 2067: 2063: 2059: 2054: 2052: 2051:shell effects 2049: 2045: 2041: 2037: 2033: 2029: 2021: 2019: 1993: 1989: 1985: 1982: 1977: 1974: 1971: 1969: 1964: 1953: 1949: 1945: 1942: 1939: 1934: 1932: 1927: 1916: 1915: 1914: 1891: 1887: 1881: 1877: 1871: 1868: 1863: 1860: 1853: 1852: 1851: 1849: 1848: 1828: 1823: 1820: 1815: 1812: 1809: 1804: 1800: 1797: 1794: 1788: 1785: 1778: 1777: 1776: 1770: 1767:(also called 1766: 1765: 1759: 1755: 1750: 1749: 1740: 1738: 1721: 1712: 1709: 1703: 1699: 1696: 1691: 1687: 1682: 1676: 1672: 1668: 1663: 1659: 1654: 1650: 1645: 1641: 1636: 1631: 1628: 1622: 1618: 1615: 1610: 1606: 1601: 1595: 1591: 1587: 1582: 1578: 1573: 1569: 1564: 1560: 1556: 1552: 1548: 1542: 1536: 1533: 1530: 1524: 1517: 1516: 1515: 1513: 1494: 1487: 1482: 1478: 1475: 1470: 1466: 1461: 1455: 1451: 1447: 1442: 1438: 1433: 1429: 1424: 1420: 1415: 1408: 1404: 1398: 1392: 1389: 1386: 1380: 1373: 1372: 1371: 1369: 1363: 1340: 1318: 1310: 1309: 1304: 1281: 1275: 1272: 1269: 1266: 1263: 1260: 1257: 1254: 1251: 1248: 1245: 1242: 1239: 1236: 1233: 1230: 1227: 1224: 1221: 1218: 1212: 1206: 1203: 1200: 1185: 1184: 1183: 1179: 1171: 1155: 1152: 1147: 1143: 1139: 1136: 1133: 1128: 1124: 1117: 1114: 1104: 1103: 1102: 1099: 1095: 1089: 1085: 1065: 1062: 1057: 1053: 1049: 1046: 1043: 1038: 1034: 1030: 1024: 1021: 1011: 1010: 1009: 1003: 1001: 998: 995:then becomes 986: 980: 978: 974: 967:; therefore, 939: 932: 928: 922: 918: 912: 909: 906: 901: 897: 883: 879: 875: 869: 866: 862: 857: 854: 850: 844: 840: 836: 833: 830: 821: 813: 812: 811: 808: 804: 798: 796: 792: 757: 750: 746: 740: 736: 730: 727: 724: 719: 715: 701: 695: 692: 689: 684: 681: 678: 672: 668: 665: 660: 655: 651: 645: 642: 637: 633: 629: 626: 623: 619: 615: 612: 609: 604: 598: 594: 590: 587: 581: 578: 574: 568: 564: 560: 557: 554: 545: 537: 536: 535: 534: 529: 525: 516: 511: 509: 506: 502: 492: 488: 484: 480: 476: 472: 471: 470: 445: 442: 435: 431: 425: 421: 415: 408: 404: 397: 393: 389: 384: 380: 369: 368: 367: 364: 360: 355: 354:symmetry axis 332: 329: 322: 318: 312: 308: 302: 295: 291: 285: 281: 275: 268: 264: 258: 254: 244: 243: 242: 223: 219: 213: 209: 203: 196: 194: 192: 189: 184: 179: 177: 173: 169: 165: 161: 157: 153: 149: 145: 141: 137: 132: 130: 126: 122: 118: 117: 112: 108: 104: 100: 99: 94: 89: 87: 83: 79: 75: 71: 67: 64: 60: 56: 52: 43: 40: 38: 34: 30: 25: 19: 2974: 2935:. Retrieved 2931: 2921: 2909:. Retrieved 2902: 2893: 2874: 2864: 2855: 2846: 2823:(507): 579, 2820: 2816: 2807: 2786: 2778: 2745: 2741: 2735: 2722: 2710:. Retrieved 2699: 2687:. Retrieved 2676: 2652: 2645: 2516: 2290: 2276: 2253: 2243:such as the 2238: 2226:tidal forces 2223: 2217:' satellite 2188: 2181: 2140:Isaac Newton 2134: 2118:Solar System 2095: 2055: 2025: 2016: 1912: 1847:eccentricity 1846: 1843: 1768: 1762: 1757: 1753: 1748:aspect ratio 1746: 1744: 1741:Aspect ratio 1736: 1509: 1361: 1338: 1306: 1302: 1296: 1181: 1097: 1093: 1087: 1083: 1080: 1007: 984: 981: 973:eccentricity 954: 806: 802: 799: 791:eccentricity 785:, therefore 772: 533:surface area 527: 523: 520: 504: 500: 498:The case of 497: 490: 486: 478: 474: 460: 362: 358: 347: 228: 221: 217: 211: 207: 182: 180: 146:(and of all 133: 115: 114: 97: 96: 90: 68:obtained by 58: 54: 50: 48: 41: 36: 18: 2245:Crab Nebula 2144:Jean Richer 2084:The planet 156:cartography 123:or a plain 2988:Categories 2928:"Spheroid" 2798:1567310192 2637:References 2297:major axis 2285:See also: 2264:lanthanide 2184:rugby ball 2176:rugby ball 2138:scientist 2122:flattening 2100:and other 2092:of 0.06487 2090:flattening 1844:The first 1769:oblateness 1764:flattening 1176:See also: 512:Properties 111:minor axis 103:rugby ball 93:major axis 2962:Spheroids 2770:121268606 2566:ρ 2550:π 2234:volcanism 2207:Enceladus 2120:, with a 2032:spherical 1986:− 1978:− 1946:− 1872:− 1816:− 1798:− 1700:β 1697:⁡ 1669:− 1619:β 1616:⁡ 1588:− 1537:λ 1531:β 1479:β 1476:⁡ 1448:− 1393:λ 1387:β 1317:longitude 1276:β 1273:⁡ 1261:λ 1258:⁡ 1252:β 1249:⁡ 1237:λ 1234:⁡ 1228:β 1225:⁡ 1207:λ 1201:β 1194:σ 1172:Curvature 1137:≈ 1115:π 1047:≈ 1031:π 997:imaginary 913:− 837:π 731:− 693:− 669:⁡ 646:π 630:π 613:⁡ 591:− 561:π 181:The word 152:flattened 78:ellipsoid 2999:Quadrics 2994:Surfaces 2869:Page 559 2762:41134011 2585:See also 2260:actinide 2189:Several 2070:Spheroid 2064:and the 1756: : 1510:and its 1360:−π < 225:(right). 197:Equation 183:spheroid 140:rotation 70:rotating 51:spheroid 2911:13 June 2825:Bibcode 2712:24 June 2689:24 June 2653:Geodesy 2606:Lentoid 2258:of the 2241:nebulae 2219:Miranda 2110:Jupiter 2098:planets 2086:Jupiter 2048:quantum 1364:< +π 1355:⁠ 1343:⁠ 1335:⁠ 1323:⁠ 1315:is the 1301:is the 977:ellipse 975:. (See 826:prolate 795:ellipse 793:. (See 610:arctanh 352:as the 172:Equator 160:geodesy 148:planets 136:gravity 125:M&M 74:ellipse 66:surface 63:quadric 61:, is a 42:prolate 2937:16 May 2881:  2795:  2768:  2760:  2664:  2517:where 2314:, and 2268:testis 2215:Uranus 2211:Tethys 2209:, and 2199:Saturn 2114:Altair 2106:Saturn 1341:< + 1319:, and 1297:where 1004:Volume 988:oblate 876:arcsin 550:oblate 142:, the 129:sphere 121:lentil 105:. The 37:oblate 2766:S2CID 2758:JSTOR 2730:, p.8 2616:Ovoid 2304:a = b 2203:Mimas 2191:moons 2152:Earth 1337:< 1140:0.523 891:where 805:> 709:where 526:< 489:> 477:< 220:> 210:< 176:poles 2939:2018 2913:2015 2879:ISBN 2871:in: 2793:ISBN 2714:2014 2691:2014 2662:ISBN 2262:and 2254:The 2213:and 2128:and 2046:and 2030:are 1745:The 1358:and 1050:4.19 979:.) 531:has 517:Area 237:and 158:and 138:and 2833:doi 2750:doi 1688:cos 1607:cos 1514:is 1467:cos 1370:is 1305:or 1270:sin 1255:sin 1246:cos 1231:cos 1222:cos 1096:= 2 1086:= 2 1081:If 797:.) 193:). 72:an 57:or 2990:: 2973:. 2930:. 2901:. 2854:. 2831:, 2821:85 2819:, 2764:. 2756:. 2746:49 2744:. 2310:, 2274:. 2247:. 2230:Io 2221:. 2205:, 2186:. 2174:A 2108:, 2068:. 2053:. 1771:) 1311:, 666:ln 503:= 446:1. 366:: 361:= 333:1. 233:, 178:. 131:. 88:. 49:A 2941:. 2915:. 2887:. 2858:. 2835:: 2827:: 2801:. 2772:. 2752:: 2716:. 2693:. 2670:. 2569:. 2563:c 2558:2 2554:a 2544:3 2541:4 2535:= 2532:M 2519:M 2498:, 2494:) 2489:2 2485:a 2481:( 2477:M 2471:5 2468:2 2462:= 2458:) 2452:2 2448:b 2444:+ 2439:2 2435:a 2430:( 2426:M 2420:5 2417:1 2411:= 2404:C 2397:, 2393:) 2387:2 2383:c 2379:+ 2374:2 2370:a 2365:( 2361:M 2355:5 2352:1 2346:= 2339:B 2336:= 2333:A 2316:B 2312:A 2308:C 2300:c 2178:. 1994:2 1990:e 1983:1 1975:1 1972:= 1965:f 1954:2 1950:f 1943:f 1940:2 1935:= 1928:e 1892:2 1888:a 1882:2 1878:c 1869:1 1864:= 1861:e 1829:. 1824:a 1821:c 1813:1 1810:= 1805:a 1801:c 1795:a 1789:= 1786:f 1773:f 1758:a 1754:c 1722:. 1713:2 1710:3 1704:) 1692:2 1683:) 1677:2 1673:a 1664:2 1660:c 1655:( 1651:+ 1646:2 1642:a 1637:( 1632:a 1629:2 1623:) 1611:2 1602:) 1596:2 1592:a 1583:2 1579:c 1574:( 1570:+ 1565:2 1561:a 1557:2 1553:( 1549:c 1543:= 1540:) 1534:, 1528:( 1525:H 1495:, 1488:2 1483:) 1471:2 1462:) 1456:2 1452:a 1443:2 1439:c 1434:( 1430:+ 1425:2 1421:a 1416:( 1409:2 1405:c 1399:= 1396:) 1390:, 1384:( 1381:K 1362:λ 1352:2 1349:/ 1346:π 1339:β 1332:2 1329:/ 1326:π 1321:− 1313:λ 1299:β 1282:, 1279:) 1267:c 1264:, 1243:a 1240:, 1219:a 1216:( 1213:= 1210:) 1204:, 1198:( 1156:. 1153:C 1148:2 1144:A 1134:C 1129:2 1125:A 1118:6 1098:c 1094:C 1088:a 1084:A 1066:. 1063:c 1058:2 1054:a 1044:c 1039:2 1035:a 1025:3 1022:4 993:e 985:S 969:e 965:a 961:c 957:z 940:. 933:2 929:c 923:2 919:a 910:1 907:= 902:2 898:e 884:) 880:e 870:e 867:a 863:c 858:+ 855:1 851:( 845:2 841:a 834:2 831:= 822:S 807:a 803:c 787:e 783:c 779:a 775:z 758:. 751:2 747:a 741:2 737:c 728:1 725:= 720:2 716:e 702:) 696:e 690:1 685:e 682:+ 679:1 673:( 661:e 656:2 652:c 643:+ 638:2 634:a 627:2 624:= 620:) 616:e 605:e 599:2 595:e 588:1 582:+ 579:1 575:( 569:2 565:a 558:2 555:= 546:S 528:a 524:c 505:c 501:a 491:a 487:c 479:a 475:c 467:c 463:a 443:= 436:2 432:c 426:2 422:z 416:+ 409:2 405:a 398:2 394:y 390:+ 385:2 381:x 363:b 359:a 350:z 330:= 323:2 319:c 313:2 309:z 303:+ 296:2 292:b 286:2 282:y 276:+ 269:2 265:a 259:2 255:x 239:c 235:b 231:a 222:a 218:c 212:a 208:c

Index


quadric
surface
rotating
ellipse
ellipsoid
semi-diameters
circular symmetry
major axis
rugby ball
American football
minor axis
lentil
M&M
sphere
gravity
rotation
figure of the Earth
planets
flattened
cartography
geodesy
reference ellipsoid
World Geodetic System
Equator
poles
Earth's gravity
geopotential model

symmetry axis

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