313:
267:
1596:
409:
621:
proposes that long term climatic cycles may be due to changes in the eccentricity of the Earth's orbit and changes in the Earth's obliquity ("
1079:
952:
907:
859:
272:
293:
1690:
710:
368:
361:
1773:
564:
472:
1416:
Michelson, Albert
Abraham; Pease, Francis G. (1921). "Measurement of the diameter of alpha Orionis with the interferometer".
402:
578:
721:
1733:
1367:
468:
334:
1717:
1526:
Russell, Ben (2023). "A curator at the height of his power: H. W. Dickinson... and the
Newcomen Society, 1919–1930".
747:
1778:
395:
36:
1768:
1205:
1149:
1113:
1057:
881:
689:
664:
discovers that the dynamical constants of motion determine the distribution function for a system of particles.
574:
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476:
161:
51:
30:
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990:
967:
840:
792:
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184:
645:
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641:
489:
236:
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100:
95:
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84:
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69:
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54:
550:
founded in the United
Kingdom for the study of the history of engineering and technology.
1609:
1431:
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900:
818:
762:
685:
1762:
1675:
1356:
1322:
1227:
1216:
1194:
1138:
1105:
1038:
933:
635:
511:
211:
194:
1627:
1712:
1506:
1330:
1326:
1075:
918:
833:
599:
709:
September 29 – First domestic radio sets come to stores in the United States – a
1578:
Théorie mathématique des phénomènes thermiques produits par la radiation solaire
1016:
751:
661:
584:
453:
174:
1311:
1265:
903:
885:
870:
796:
743:
464:
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982:
948:
855:
836:
591:
457:
1741:
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1649:
460:
on its way to the Moon, the newspaper will publicly retract this position.
1345:
926:
725:
588:
529:
507:
532:(35.45) is a weighted average of the almost integral masses for the two
1183:
1153:
1109:
1053:
807:
655:
595:
568:
533:
425:
1635:
1498:
1135:
767:
758:
1546:
1480:
1528:
International
Journal for the History of Engineering and Technology
1439:
773:
742:
establishes the world's first institute for the academic study of
706:
July 25 – The first transatlantic two-way radio broadcast is made.
577:
first describes some of the symptoms of what will become known as
1734:"Who did actually invent the word "robot" and what does it mean?"
500:
467:
is the first to have its diameter determined by an optical
506:
almost certainly originates in Léopoldville, modern-day
1715:(September 1979). "The Vocabulary of Science Fiction".
1674:
1681:. Urbana: University of Illinois Press. p.
1547:"Ueber zwei neue Reduktionsprodukte des Kodeins"
433:involved some significant events, listed below.
1597:Philosophical Transactions of the Royal Society
1030:, German molecular and nuclear physicist (died
1592:"The Phenomenon of Rupture and Flow in Solids"
403:
8:
1370:, English astronomer and photographer (born
1254:, French chemist and mining engineer (born
410:
396:
219:
1617:
18:Overview of the events of 1920 in science
1230:, German historian of mathematics (born
1545:Mannich, C.; Löwenheim, Helene (1920).
1384:
810:, Chinese-born computer engineer (died
342:
326:
321:
301:
280:
259:
243:
222:
20:
598:, is first synthesized in Germany by
7:
989:and scientific administrator at the
1677:Theremin: Ether Music and Espionage
821:, American thoracic surgeon (died
716:October – Young Russian physicist
14:
1590:Griffith, A. A. (February 1920).
1041:, American cardiac surgeon (died
541:History of science and technology
463:December 13 – The red giant star
369:List of open letters by academics
362:Timeline of cosmological theories
1455:"HIV pandemic's origins located"
1299:, Russian-born astronomer (born
768:R.U.R: Rossum's Universal Robots
473:Michelson stellar interferometer
638:states his ionization equation.
1452:Based on its genetic history.
671:'s analysis of the process of
654:predicts the existence of the
1:
1481:"Isotopes and Atomic Weights"
1241:, Indian mathematician (born
1197:, German mathematician (born
722:electronic musical instrument
608:founded in the United States.
528:shows that the molar mass of
456:is impossible. In 1969, with
376:History of technology by type
294:Governance and policy studies
1219:, American astronomer (born
322:Extraterrestrial environment
1368:William de Wiveleslie Abney
1359:, Russian astronomer (born
1019:, American geologist (died
469:astronomical interferometer
448:ridicules rocket scientist
437:Astronomy and space science
268:Sustainable energy research
1795:
1650:"What happened on July 25"
1208:, American botanist (born
936:, Chinese physicist (died
1393:"Robert H. Goddard Story"
579:Creutzfeldt–Jakob disease
383:List of science timelines
273:Transportation technology
1718:Asimov's Science Fiction
1673:Glinsky, Albert (2000).
1628:2027/uiug.30112007702761
1565:10.1002/ardp.19202580218
1206:Mary Katharine Brandegee
1150:Hieronymus Georg Zeuthen
690:Little Albert experiment
575:Hans Gerhard Creutzfeldt
477:Mount Wilson Observatory
31:List of years in science
1774:20th century in science
1738:Karel Čapek (1890–1938)
991:Smithsonian Institution
771:, introducing the word
499:Approximate date – The
479:'s reflector telescope.
327:Terrestrial environment
1732:Zunt, Dominik (2004).
1619:10.1098/rsta.1921.0006
966:, American physicist,
793:evolutionary biologist
791:, British theoretical
748:Upper Dacia University
724:which will become the
718:Lev Sergeyevich Termen
694:classical conditioning
1479:Aston, F. W. (1920).
1419:Astrophysical Journal
1180:William Chester Minor
602:and Helene Löwenheim.
510:, the capital of the
314:Dinosaurs' extinction
1552:Archiv der Pharmazie
1459:University of Oxford
1252:Marie Adolphe Carnot
1156:mathematician (born
830:Nicolaas Bloembergen
1610:1921RSPTA.221..163G
1604:(582–593): 163–98.
1432:1921ApJ....53..249M
1239:Srinivasa Ramanujan
1132:Zygmunt Janiszewski
923:mechanical engineer
720:first develops the
623:Milankovitch cycles
594:closely related to
1091:Abraham Lilienfeld
789:John Maynard Smith
713:radio costs $ 10.
619:Milutin Milanković
606:Black Cross Nurses
445:The New York Times
1493:(2646): 617–619.
1050:Peter D. Mitchell
1002:Rosalind Franklin
897:Edmond H. Fischer
867:Katsuko Saruhashi
852:E. Donnall Thomas
652:Ernest Rutherford
561:Frederick Banting
450:Robert H. Goddard
420:
419:
218:
217:
43:
42:
1786:
1779:1920s in science
1753:
1752:
1750:
1749:
1740:. Archived from
1729:
1723:
1722:
1709:
1703:
1702:
1700:
1699:
1680:
1670:
1664:
1663:
1661:
1660:
1654:Dates in History
1646:
1640:
1639:
1621:
1587:
1581:
1575:
1569:
1568:
1559:(2–4): 295–316.
1542:
1536:
1535:
1523:
1517:
1516:
1514:
1513:
1499:10.1038/105617a0
1476:
1470:
1469:
1467:
1466:
1450:
1444:
1443:
1413:
1407:
1406:
1404:
1403:
1389:
1165:Charles Lapworth
1069:Baruj Benacerraf
1028:Eleonore Trefftz
1006:crystallographer
964:Owen Chamberlain
673:brittle fracture
669:Alan A. Griffith
548:Newcomen Society
494:dendrochronology
412:
405:
398:
335:Tornado research
220:
25:
24:
21:
1794:
1793:
1789:
1788:
1787:
1785:
1784:
1783:
1769:1920 in science
1759:
1758:
1757:
1756:
1747:
1745:
1731:
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1726:
1711:
1710:
1706:
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1543:
1539:
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1520:
1511:
1509:
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1477:
1473:
1464:
1462:
1453:
1451:
1447:
1415:
1414:
1410:
1401:
1399:
1397:astronauticsnow
1391:
1390:
1386:
1381:
1342:Reginald Farrer
1127:
1116:laureate (died
1082:laureate (died
1060:laureate (died
1048:September 29 –
979:David Challinor
970:laureate (died
955:laureate (died
910:laureate (died
884:, English-born
843:laureate (died
784:
757:Publication in
735:
703:
682:
667:Publication of
642:Albert Einstein
632:
615:
557:
546:September 10 –
543:
521:
490:Andrew Douglass
486:
452:, stating that
439:
416:
281:Social sciences
239:
234:
224:1920 in science
209:
166:
125:
87:
19:
12:
11:
5:
1792:
1790:
1782:
1781:
1776:
1771:
1761:
1760:
1755:
1754:
1724:
1704:
1691:
1665:
1641:
1582:
1570:
1537:
1518:
1471:
1445:
1440:10.1086/142603
1408:
1383:
1382:
1380:
1377:
1376:
1375:
1364:
1353:
1338:
1319:
1308:Norman Lockyer
1304:
1297:Hermann Struve
1293:
1275:
1274:
1273:
1264:, New Zealand
1259:
1246:
1235:
1224:
1213:
1202:
1191:
1176:
1161:
1146:
1126:
1123:
1122:
1121:
1102:
1095:epidemiologist
1089:November 13 –
1087:
1065:
1046:
1035:
1024:
1013:
998:
975:
960:
945:François Jacob
941:
930:
915:
901:Swiss American
893:
878:
863:
848:
826:
819:Henry Heimlich
815:
804:
783:
780:
779:
778:
755:
734:
731:
730:
729:
714:
707:
702:
699:
698:
697:
686:John B. Watson
681:
678:
677:
676:
665:
659:
649:
646:Leiden Lecture
639:
631:
628:
627:
626:
614:
611:
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609:
603:
582:
572:
556:
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552:
551:
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57:
48:
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41:
40:
33:
28:
17:
13:
10:
9:
6:
4:
3:
2:
1791:
1780:
1777:
1775:
1772:
1770:
1767:
1766:
1764:
1744:on 2012-02-04
1743:
1739:
1735:
1728:
1725:
1720:
1719:
1714:
1713:Asimov, Isaac
1708:
1705:
1694:
1692:0-252-02582-2
1688:
1684:
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1678:
1669:
1666:
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1460:
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1433:
1429:
1426:(5): 249–59.
1425:
1421:
1420:
1412:
1409:
1398:
1394:
1388:
1385:
1378:
1373:
1369:
1366:December 3 –
1365:
1362:
1358:
1357:Ludwig Struve
1355:November 4 –
1354:
1351:
1347:
1343:
1340:October 17 –
1339:
1336:
1332:
1328:
1324:
1323:Wilhelm Wundt
1320:
1317:
1313:
1309:
1305:
1302:
1298:
1294:
1291:
1287:
1284:
1280:
1279:Ádám Politzer
1276:
1271:
1267:
1263:
1260:
1257:
1253:
1250:
1249:
1247:
1244:
1240:
1236:
1233:
1229:
1228:Moritz Cantor
1225:
1222:
1218:
1217:John Brashear
1214:
1211:
1207:
1203:
1200:
1196:
1195:Paul Bachmann
1192:
1189:
1185:
1181:
1177:
1174:
1170:
1166:
1162:
1159:
1155:
1151:
1147:
1144:
1140:
1139:mathematician
1137:
1133:
1129:
1128:
1124:
1119:
1115:
1111:
1107:
1106:George Porter
1104:December 6 –
1103:
1100:
1096:
1092:
1088:
1085:
1081:
1077:
1074:
1070:
1067:October 29 –
1066:
1063:
1059:
1055:
1051:
1047:
1044:
1040:
1039:Denton Cooley
1036:
1033:
1029:
1025:
1022:
1018:
1014:
1011:
1007:
1003:
999:
996:
992:
988:
984:
980:
976:
973:
969:
965:
961:
958:
954:
950:
946:
942:
939:
935:
934:Tang Dingyuan
931:
928:
924:
920:
916:
913:
909:
905:
902:
898:
894:
891:
887:
883:
879:
876:
872:
868:
864:
861:
857:
853:
849:
846:
842:
838:
835:
831:
827:
824:
820:
817:February 3 –
816:
813:
809:
806:February 7 –
805:
802:
798:
794:
790:
787:January 20 –
786:
785:
781:
777:to the world.
776:
775:
770:
769:
764:
760:
756:
753:
749:
745:
741:
740:Emil Racoviță
737:
736:
732:
727:
723:
719:
715:
712:
708:
705:
704:
700:
695:
691:
688:conducts the
687:
684:
683:
679:
674:
670:
666:
663:
660:
657:
653:
650:
647:
644:delivers his
643:
640:
637:
636:Megh Nad Saha
634:
633:
629:
624:
620:
617:
616:
612:
607:
604:
601:
597:
593:
590:
586:
583:
580:
576:
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566:
562:
559:
558:
554:
549:
545:
544:
540:
535:
531:
527:
523:
522:
518:
513:
512:Belgian Congo
509:
505:
502:
498:
495:
491:
488:
487:
483:
478:
474:
470:
466:
462:
459:
455:
451:
447:
446:
442:January 13 –
441:
440:
436:
434:
432:
428:
427:
413:
408:
406:
401:
399:
394:
393:
391:
390:
385:
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380:
378:
377:
373:
371:
370:
366:
364:
363:
359:
357:
354:
352:
349:
348:
347:
346:
343:Other/related
341:
336:
333:
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331:
330:
325:
320:
315:
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310:
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56:
53:
50:
49:
47:
46:
38:
34:
32:
29:
27:
26:
23:
22:
16:
1746:. Retrieved
1742:the original
1737:
1727:
1716:
1707:
1696:. Retrieved
1676:
1668:
1657:. Retrieved
1653:
1644:
1601:
1595:
1585:
1577:
1573:
1556:
1550:
1540:
1531:
1527:
1521:
1510:. Retrieved
1490:
1484:
1474:
1463:. Retrieved
1461:. 2014-10-03
1448:
1423:
1417:
1411:
1400:. Retrieved
1396:
1387:
1331:psychologist
1327:physiologist
1321:August 31 –
1306:August 16 –
1295:August 12 –
1277:August 10 –
1148:January 6 –
1130:January 3 –
1076:immunologist
1037:August 22 –
1026:August 15 –
929:(died 2012).
919:Alex Moulton
772:
766:
711:Westinghouse
600:Carl Mannich
567:co-discover
565:Charles Best
443:
423:
421:
381:
374:
367:
360:
304:Paleontology
303:
223:
210:
204:
185:Architecture
106:
105:
15:
1237:April 26 –
1193:March 31 –
1182:, American
1178:March 26 –
1163:March 13 –
1114:Nobel Prize
1093:, American
1080:Nobel Prize
1058:Nobel Prize
1017:Marie Tharp
981:, American
968:Nobel Prize
953:Nobel Prize
908:Nobel Prize
882:Barbara Low
880:March 23 –
865:March 22 –
860:Nobel Prize
854:, American
850:March 15 –
841:Nobel Prize
828:March 11 –
763:Karel Čapek
738:April 26 –
662:James Jeans
613:Meteorology
585:Hydrocodone
526:F. W. Aston
454:spaceflight
252:Archaeology
180:Archaeology
1763:Categories
1748:2011-12-06
1698:2012-01-09
1659:2012-01-09
1512:2023-04-25
1465:2014-10-05
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1379:References
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