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Commentariolus

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395:. Copernicus states that whenever the point e1 lies on the line joining the Earth to the centre of its orbit (represented by the dotted line OTC in the diagram, of which only the point T here lies in the Moon's orbital plane), the Moon M will lie precisely between e1 and e2. However, this can occur only once every 19 years, when this line coincides with the line of nodes WTE. At other times it does not lie in the moon's orbital plane and the point e1 cannot therefore pass through it. In general, then, while the Moon will be 38: 428: 361: 297:
successively shorter periods of revolution, Saturn's being between 29 and 30 years, Jupiter's between 11 and 12, Mars's between 2 and 3, Earth's exactly one, Venus's between 8 and 9 months, and Mercury's between 2 and 3 months. The Moon's sphere, however, revolves around the Earth in a period of one month, and moves with it around the Sun like an
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which precesses from east to west around an axis perpendicular to that plane, with a period of between 18 and 19 years with respect to the fixed stars. The remaining three motions, which take place within this orbital plane, are depicted in the diagram to the right. The first of these is that of the first, and larger, of two
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of the Earth's axis of rotation about an axis perpendicular to the plane of its orbit. Copernicus specified the rate of this precession with respect to the radial line from the Earth to the centre of its orbit as being slightly less than a year, with an implied direction as being from west to east.
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that he assumes to remain fixed, the mechanism he uses to model them does cause tiny oscillations in the lines of nodes as well. As Kepler later pointed out, the necessity for assuming oscillations in the inclinations of the outer planets' orbital planes is an artefact of Copernicus's having taken
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Like the Moon's motion, that of the outer planets, represented in the diagram to the right, is produced by a combination of a deferent and two epicycles. The centre of the first, and larger of the two epicycles, represented by the point e1 in the diagram, revolves uniformly from west to east around
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Here Copernicus asserts that the motion of the equinoxes and celestial poles has not been uniform, and argues that consequently they should not be used to define the reference frame with respect to which the motions of the planets are measured, and that the periods of the various planetary motions
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with that of the Earth, but do share its centre as their own common centre, and lie in planes that are only slightly inclined to the Earth's orbital plane. Unlike the Moon's orbital plane, those of the superior planets do not precess. Their inclinations to the Earth's orbital plane do oscillate,
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Including the annual revolution around the Sun, which the Moon shares with the Earth in his system, Copernicus explains the Moon's motion as composed of five independent motions. Its motion around the Earth lies in a plane which is inclined at an angle of 5° to the plane of the Earth's orbit, and
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In this section, the heavenly spheres are given in order from outermost to innermost. The outermost sphere is that of the fixed stars, which remains perfectly stationary. Then follow those of Saturn, Jupiter, Mars, Earth, Venus and Mercury, which each revolve about the Sun from west to east with
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The period referred to here is the time between two successive passages of the epicycle's centre through its ascending node (represented in the diagram by the point W), or two successive passages through its descending node (represented in the diagram by the point E). Copernicus does not always
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The Commentariolus is subdivided into eight sections (or chapters), of which all but the first bear brief descriptive titles. After a brief introduction, the first section states seven postulates from which Copernicus proposes to show that the apparent motion of the planets can be explained
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This section explains how the apparent motion of the Sun could arise from three separate motions of the Earth. The first motion is a uniform revolution, with a period of one year, from west to east along a circular orbit whose centre is offset from the Sun by 1/25 of the orbit's radius.
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circulated for a time after Copernicus's death, it subsequently lapsed into obscurity, and its previous existence remained known only indirectly, until a surviving manuscript copy was discovered and published in the second half of the nineteenth century.
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EW, and the point e2 describes an eccentric circle whose radius is equal to that of the deferent, and whose centre, represented by the point O in the diagram, is offset from that of the deferent by the radius of the first epicycle. In his later work,
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The planet itself, represented by the point P in the diagram, revolves uniformly from west to east around the circumference of the second epicycle, whose radius is exactly one third of that of the first, at twice the rate of revolution of e1 about
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Mercury's orbit is harder than any of the other planets' to study because it is visible for only a few days a year. Mercury, just like Venus, has two epicycles, one greater than another. It takes almost three months to complete a revolution.
384:. The centre of the second, smaller epicycle (represented by the point e2 in the diagram) moves uniformly from east to west around the circumference of the first so that the period of the angle β in the diagram is one 452:
The centre of the second epicycle, represented by the point e2 in the diagram, revolves uniformly from east to west around the circumference of the first, with the same period relative to the radial line joining
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by a distance one and a third times the radius of Copernicus's first epicycle. The centre of the planet's deferent, with the same radius as Copernicus's, would lie at the point C, mid-way between
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however, between the limits 0°10′ and 1°50′ for Mars, 1°15′ and 1°40′ for Jupiter, and 2°15′ and 2°40′ for Saturn. Although Copernicus supposes these oscillations to take place around the orbits'
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for the motions of the outer planets all have the same general structure, and only differ in the values of the various parameters needed to specify their motions completely. Their orbits are not
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for the motions of the outer planets. In a heliocentric version of Ptolemy's models, his equant would lie at the point Q in the diagram, offset along the line of apses EW from the point
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The Moon itself, represented by the point M in the diagram, moves uniformly from west to east around the circumference of the second epicycle so that the period of the angle Îł is half a
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in Latin by 1514 and circulated copies to his friends and colleagues. It thus became known among Copernicus's contemporaries, though it was never printed during his lifetime. In 1533,
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and Q. The planet itself would lie at the point of intersection of this deferent with the line QP. While this point only coincides exactly with P whenever they are both at an
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them as passing through the centre of the Earth's orbit. If he had taken them as passing through the Sun, he would not have needed to introduce these oscillations.
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That is, a circle whose centre is offset from what would be regarded as the natural centre of the planet's orbit—in this case, the centre of the Earth's orbit.
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Copernicus does not give these ratios directly, but expresses the radii of the planets' deferents and epicycles in terms of a unit of length which is
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Bardi, A. (2024). Copernicus and Axiomatics. In: Sriraman, B. (eds) Handbook of the History and Philosophy of Mathematical Practice. Springer, Cham.
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distinguish which periods and which types of month he is referring to, but these can be inferred from our knowledge of the actual motion of the Moon.
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and since the preceding year a cardinal, wrote to Copernicus from Rome and asked him for a copy of his writings "at the earliest possible moment".
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In the last two sections Copernicus talks about Venus and Mercury. The first has a system of circles and takes 9 months to complete a revolution.
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are more accurately determinable if those motions are measured with respect to the fixed stars. He maintains that he had found the length of the
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to e1. As a consequence, the direction of the radial line joining e1 to e2 remains fixed relative to the fixed stars, parallel to the planet's
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The second motion is the daily rotation about an axis which passes through the Earth's centre and is inclined at an angle of about 23
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of the universe. After further long development of his theory, Copernicus published the mature version in 1543 in his landmark work,
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conjunction or opposition to the Sun whenever it lies precisely between e1 and e2, these events will not be precisely simultaneous.
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The Earth is moved in a sphere around the Sun, causing the apparent annual migration of the Sun; the Earth has more than one motion.
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The distance between the Earth and the Sun is an insignificant fraction of the distance from the Earth and the Sun to the stars, so
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Copernicus does not specify which type of month he is referring to. His period for Venus would be correct if he were referring to
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The ratio which Copernicus took as that for the relative lengths of the small epicycle, large epicycle and deferent is 4:19:180.
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Three Copernican Treatises: The Commentariolus of Copernicus; The Letter against Werner; The Narratio Prima of Rheticus
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for Saturn. For the ratios of the radii of their deferents to the radii of the larger of their epicycles, it gives 6
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The Earth’s orbital motion around the Sun causes the seeming reverse in direction of the motions of the planets.
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obtained a copy in 1575, and subsequently presented copies to students and colleagues as tokens of his esteem.
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the circumference of a deferent whose centre is the centre of the Earth's orbit, represented by the point
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https://web.archive.org/web/20090803215559/http://www.geocities.com/soho/gallery/8084/copernicus.htm
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The stars are immovable; their apparent daily motion is caused by the daily rotation of the Earth.
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For the ratios of the radii of the outer planets' deferents to radius of the Earth, the
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is contained in a library catalogue, dated 1 May 1514, of a 16th-century historian,
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centred on the Earth (represented by point T in the diagram), with a period of one
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in the diagram, with a period relative to the fixed stars as given in the section
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http://www.fh-augsburg.de/%7Eharsch/Chronologia/Lspost16/Copernicus/kop_c00.html
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Schönberg, Nicholas, Letter to Nicolaus Copernicus, translated by Edward Rosen
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Tycho Brahe; a picture of scientific life and work in the sixteenth century
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Equal motion should be measured not by the equinoxes but by the fixed stars
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heard the lectures and were interested in the theory. On 1 November 1536,
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is the centre of the lunar sphere—the orbit of the Moon around the Earth.
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Quod aequalitas motum non ad aequinoctia sed ad stellas fixas referatur
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Diagram of an outer planet's orbit, as described by Copernicus in his
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De hypothesibus motuum coelestium a se constitutis commentariolus
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The manuscripts of Nicholas Copernicus' minor works; facsimiles
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was discovered in Vienna and published in 1878. It was said by
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Diagram of the Moon's orbit, as described by Copernicus in his
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The Astronomical Revolution: Copernicus – Kepler – Borelli
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Celestial bodies do not all revolve around a single point.
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At all other times it will lie strictly between Q and P.
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A translation of the Commentariolus with commentary.",
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A value that lies within one minute of what it is now.
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to have always been 365 days 6 hours and 10 minutes.
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Complete Latin text online at Bibliotheca Augustana.
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Venus's period is, however, less than 8 406:The outer planets, Saturn, Jupiter and Mars 188:, which is near the centre of the Universe. 1118: 1104: 1096: 743: 628:, pp. 6–7), a manuscript copy of the 115:On the Revolutions of the Heavenly Spheres 36: 29: 1085: 971:Copernicus and the Aristotelian tradition 779: 883: 871: 739: 728: 588: 914:, Krakow: Polish Academy of Sciences, 819: 803: 717:th of the radius of the Earth's orbit. 852: 835: 767: 747: 735: 633: 625: 410:The theories Copernicus gives in the 7: 1170:De revolutionibus orbium coelestium 465:De revolutionibus orbium coelestium 218:De motibus qui circa solem apparent 110:De revolutionibus orbium coelestium 1083:Edward Rosen's English translation 908:(1992), Czartoryski, Pawel (ed.), 184:All the spheres rotate around the 128:delivered a series of lectures in 25: 1236:Nicolaus Copernicus Gesamtausgabe 222:"The apparent motions of the Sun" 480:, a much-criticised feature of 333:With respect to the fixed stars 1177:Locationes mansorum desertorum 974:. Leiden, Netherlands: Brill. 305:The apparent motion of the Sun 132:outlining Copernicus' theory. 126:Johann Albrecht Widmannstetter 1: 953:. London: William Heinemann. 640:. This seems to be a mistake. 195:is not observed in the stars. 1345:Works by Nicolaus Copernicus 1309:Copernicus (Martian crater) 482:Claudius Ptolemy's theories 337:precession of the equinoxes 1366: 1207:Lucas Watzenrode the Elder 1053:Cambridge University Press 1045:Thoren, Victor E. (1990). 214:"The order of the spheres" 1304:Copernicus (lunar crater) 35: 1141:Copernican heliocentrism 998:Cornell University Press 851:English translations by 746:, pp. 20, 208–52); 446:The order of the spheres 292:The order of the spheres 1086:(2004, pp.57–65)) 929:Dreyer, John Louis Emil 151:Although copies of the 1184:Monetae cudendae ratio 939:Adam and Charles Black 435: 368: 326:The third motion is a 142:Nikolaus von Schönberg 1230:Scientific Revolution 1191:Theophylact Simocatta 1146:Copernican Revolution 1048:The Lord of Uraniborg 968:Goddu, AndrĂ© (2010). 430: 363: 120:Copernicus wrote the 1247:Copernican principle 951:The Book Nobody Read 906:Copernicus, Nicolaus 742:, pp. 423–24); 250:"The outer planets: 169:The seven postulates 1127:Nicolaus Copernicus 738:, pp. 18–28); 595:A reference to the 553:for Jupiter, and 11 146:Archbishop of Capua 105:heliocentric theory 101:Nicolaus Copernicus 52:Nicolaus Copernicus 32: 1330:16th-century books 1252:Frombork Cathedral 874:, pp. 456–57. 601:Matthew of Miechow 523:for Jupiter, and 9 436: 369: 177:The centre of the 138:Catholic cardinals 27:Work by Copernicus 1317: 1316: 1134:Scientific career 1028:Swerdlow, Noel M. 981:978-90-04-18107-6 638:De revolutionibus 386:anomalistic month 97:Little Commentary 87: 86: 18:Little Commentary 16:(Redirected from 1357: 1213:Lucas Watzenrode 1189:Translations of 1120: 1113: 1106: 1097: 1066: 1041: 1023: 1011: 990:KoyrĂ©, Alexandre 985: 964: 942: 924: 887: 881: 875: 869: 860: 849: 843: 833: 827: 817: 811: 801: 795: 789: 783: 777: 771: 765: 759: 744:Copernicus (1992 733: 718: 716: 715: 711: 705: 699: 696: 690: 687: 681: 677: 671: 668: 662: 647: 641: 622: 616: 610: 604: 593: 562: 561: 557: 552: 551: 547: 542: 541: 537: 532: 531: 527: 522: 521: 517: 512: 511: 507: 491: 487: 475: 456: 442: 382:draconitic month 322: 321: 317: 210:De ordine orbium 165:systematically. 134:Pope Clement VII 79:Publication date 40: 33: 21: 1365: 1364: 1360: 1359: 1358: 1356: 1355: 1354: 1335:Astronomy books 1320: 1319: 1318: 1313: 1218: 1195: 1150: 1129: 1124: 1073: 1063: 1044: 1031: 1026: 1014: 1008: 988: 982: 967: 961: 947:Gingerich, Owen 945: 927: 922: 904: 895: 890: 882: 878: 870: 863: 850: 846: 834: 830: 818: 814: 802: 798: 790: 786: 778: 774: 766: 762: 734: 730: 726: 721: 713: 709: 708: 706: 702: 697: 693: 688: 684: 678: 674: 669: 665: 655:sidereal months 648: 644: 623: 619: 611: 607: 594: 590: 586: 577: 569: 559: 555: 554: 549: 545: 544: 539: 535: 534: 529: 525: 524: 519: 515: 514: 509: 505: 504: 489: 485: 473: 454: 440: 408: 358: 345: 319: 315: 314: 307: 294: 171: 162: 80: 43: 28: 23: 22: 15: 12: 11: 5: 1363: 1361: 1353: 1352: 1347: 1342: 1340:Texts in Latin 1337: 1332: 1322: 1321: 1315: 1314: 1312: 1311: 1306: 1301: 1296: 1295: 1294: 1289: 1284: 1279: 1274: 1269: 1261: 1254: 1249: 1244: 1242:Copernicus law 1239: 1232: 1226: 1224: 1220: 1219: 1217: 1216: 1210: 1203: 1201: 1197: 1196: 1194: 1193: 1187: 1180: 1173: 1166: 1163:Commentariolus 1158: 1156: 1152: 1151: 1149: 1148: 1143: 1137: 1135: 1131: 1130: 1125: 1123: 1122: 1115: 1108: 1100: 1094: 1093: 1088: 1080: 1072: 1071:External links 1069: 1068: 1067: 1061: 1042: 1024: 1012: 1006: 996:. 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Index

Little Commentary

Nicolaus Copernicus
Latin
Astronomy
Nicolaus Copernicus
heliocentric theory
De revolutionibus orbium coelestium
Johann Albrecht Widmannstetter
Rome
Pope Clement VII
Catholic cardinals
Nikolaus von Schönberg
Archbishop of Capua
Earth
Sun
parallax
Moon
Saturn
Jupiter
Mars
Venus
Mercury
epicycle
precession
precession of the equinoxes
sidereal year

epicycles
deferent

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