1389:
20:
1383:
1164:
1174:
1287:
1210:
1203:
78:
Historically, several other ancient timekeeping systems are known to have begun the day at twilight. In this case the practice in Italy dates to the
1741:
1196:
773:
609:
1967:
238:
1710:
1977:
1461:
723:
378:
64:
1534:
602:
1715:
685:
1670:
1650:
1596:
1481:
1317:
976:
101:
Many historic buildings in Italy feature old clock faces divided into six hours, which make four revolutions per day.
75:, approximately half an hour after sunset, and the following 24 hours are divided into four cycles of six hours each.
888:
1337:
1322:
1260:
1239:
328:
308:
1972:
1491:
1302:
1039:
768:
318:
231:
738:
1751:
1529:
1431:
1347:
1342:
994:
645:
19:
1904:
809:
754:
708:
693:
338:
163:
1731:
1645:
1471:
1332:
1060:
1029:
478:
373:
224:
1941:
1736:
1591:
1456:
1408:
1277:
934:
393:
353:
114:
1916:
1690:
1614:
1544:
883:
861:
728:
552:
523:
458:
451:
1764:
1629:
1446:
964:
843:
743:
596:
499:
403:
1177:
1909:
1655:
1634:
1586:
1549:
1362:
1082:
1070:
898:
866:
698:
567:
483:
473:
388:
138:
36:
104:
A clock which counted only six hours had the advantage of being much simpler mechanically.
1640:
1619:
1451:
1423:
1144:
1009:
986:
954:
906:
893:
856:
838:
468:
463:
91:
24:
1936:
1695:
1685:
1624:
1581:
1413:
1403:
1372:
1272:
1244:
1087:
1077:
876:
748:
718:
703:
488:
446:
441:
313:
1961:
1823:
1774:
1759:
1705:
1476:
1312:
1307:
1223:
1167:
1117:
1065:
999:
971:
959:
949:
939:
821:
665:
591:
540:
493:
408:
368:
363:
358:
291:
95:
68:
1921:
1808:
1803:
1798:
1785:
1524:
1139:
1133:
799:
733:
655:
586:
535:
383:
323:
83:
1188:
1931:
1926:
1571:
1554:
1486:
1466:
1352:
1234:
1149:
1127:
1034:
1019:
814:
794:
784:
713:
670:
650:
579:
398:
300:
87:
79:
1946:
1899:
1883:
1769:
1675:
1496:
1357:
1327:
1265:
1044:
944:
851:
826:
629:
413:
1843:
1680:
1564:
1539:
1519:
1436:
1388:
1382:
1367:
1107:
1024:
660:
572:
547:
528:
418:
1878:
1858:
1700:
1606:
1506:
1297:
1292:
675:
436:
428:
286:
276:
86:
whence it spread to other parts of central Italy. It originates from the
72:
1873:
1863:
1793:
1665:
1576:
1441:
1014:
1004:
926:
917:
902:
804:
789:
634:
557:
266:
1868:
1818:
1813:
1112:
271:
94:. While common from the 1400s to the 1600s, it was replaced by the
1848:
1660:
1559:
1514:
1122:
871:
562:
518:
510:
18:
1853:
1838:
1828:
1282:
1219:
261:
247:
1192:
220:
71:. In this system, the day starts at the evening, at the end of
1833:
98:
first in the north, and in the south around the early 1800s.
1288:
International Earth
Rotation and Reference Systems Service
216:
1892:
1783:
1750:
1724:
1605:
1505:
1422:
1396:
1253:
1100:
1053:
985:
925:
915:
837:
764:
684:
625:
509:
427:
337:
299:
285:
254:
1204:
232:
58:
48:
8:
207:La misteriosa storia degli orologi a sei ore
195:Horologi elementari divisi in quattro parti
1211:
1197:
1189:
922:
296:
239:
225:
217:
92:dividing the day according to prayer times
1742:International Commission on Stratigraphy
127:
67:which was invented before the modern
7:
1173:
133:
131:
14:
1462:Discrete time and continuous time
1387:
1381:
1172:
1163:
1162:
65:date and time notation in Italy
1535:History of timekeeping devices
139:"Six-hour clock - Worldtempus"
1:
193:Martinelli, Domenico (1669),
1968:Date and time representation
1482:Gravitational time dilation
1318:Barycentric Coordinate Time
977:Geological history of Earth
16:Historic timekeeping system
1996:
1338:Geocentric Coordinate Time
1323:Barycentric Dynamical Time
1261:Coordinated Universal Time
329:Orders of magnitude (time)
117:, another six-hour system.
1492:Time-translation symmetry
1379:
1303:International Atomic Time
1230:
1158:
1040:Time translation symmetry
205:Severino, Nicola (2011),
170:(in Italian). 22 May 2015
63:) system, is a system of
1978:Time measurement systems
41:sistema orario a sei ore
1752:Astronomical chronology
1725:Archaeology and geology
1432:Absolute space and time
1348:IERS Reference Meridian
1343:International Date Line
1254:International standards
995:Absolute space and time
646:Astronomical chronology
1045:Time reversal symmetry
349:Italian six-hour clock
59:
49:
40:
28:
23:Six-hour clock at the
1711:Weekday determination
1597:Sundial markup schema
810:Time and fate deities
755:The Unreality of Time
694:A series and B series
22:
1732:Chronological dating
1472:Theory of relativity
1333:Daylight saving time
1061:Chronological dating
1030:Theory of relativity
374:Daylight saving time
1942:Time value of money
1737:Geologic time scale
1592:History of sundials
1457:Cosmological decade
1409:Greenwich Mean Time
1240:Orders of magnitude
354:Thai six-hour clock
164:"Orologi a sei ore"
115:Thai six-hour clock
43:), also called the
1917:Mental chronometry
1545:Marine chronometer
1397:Obsolete standards
884:Rosy retrospection
862:Mental chronometry
686:Philosophy of time
143:en.worldtempus.com
29:
1955:
1954:
1765:Nuclear timescale
1447:Continuous signal
1186:
1185:
1096:
1095:
1071:Circadian rhythms
889:Tense–aspect–mood
744:Temporal finitism
621:
620:
597:Grandfather clock
168:Pistoia nel mondo
1985:
1973:Culture of Italy
1656:Dominical letter
1587:Equation of time
1550:Marine sandglass
1391:
1385:
1363:Terrestrial Time
1220:Time measurement
1213:
1206:
1199:
1190:
1176:
1175:
1166:
1165:
1083:Glottochronology
923:
839:Human experience
699:B-theory of time
297:
241:
234:
227:
218:
213:
209:
201:
197:
180:
179:
177:
175:
160:
154:
153:
151:
149:
135:
62:
52:
1995:
1994:
1988:
1987:
1986:
1984:
1983:
1982:
1958:
1957:
1956:
1951:
1888:
1779:
1746:
1720:
1601:
1501:
1452:Coordinate time
1424:Time in physics
1418:
1392:
1386:
1377:
1249:
1226:
1217:
1187:
1182:
1154:
1145:Time immemorial
1092:
1049:
1010:Coordinate time
981:
935:Geological time
911:
894:Time management
857:Generation time
841:
833:
778:
760:
680:
639:
617:
505:
423:
340:
333:
289:
281:
250:
245:
211:
204:
199:
192:
189:
187:Further reading
184:
183:
173:
171:
162:
161:
157:
147:
145:
137:
136:
129:
124:
110:
25:Quirinal Palace
17:
12:
11:
5:
1993:
1992:
1989:
1981:
1980:
1975:
1970:
1960:
1959:
1953:
1952:
1950:
1949:
1944:
1939:
1937:Time metrology
1934:
1929:
1924:
1919:
1914:
1913:
1912:
1902:
1896:
1894:
1893:Related topics
1890:
1889:
1887:
1886:
1881:
1876:
1871:
1866:
1861:
1856:
1851:
1846:
1841:
1836:
1831:
1826:
1821:
1816:
1811:
1806:
1801:
1796:
1790:
1788:
1781:
1780:
1778:
1777:
1772:
1767:
1762:
1756:
1754:
1748:
1747:
1745:
1744:
1739:
1734:
1728:
1726:
1722:
1721:
1719:
1718:
1713:
1708:
1703:
1698:
1693:
1688:
1683:
1678:
1673:
1668:
1663:
1658:
1653:
1648:
1643:
1638:
1632:
1627:
1622:
1617:
1611:
1609:
1603:
1602:
1600:
1599:
1594:
1589:
1584:
1582:Dialing scales
1579:
1574:
1569:
1568:
1567:
1557:
1552:
1547:
1542:
1537:
1532:
1527:
1522:
1517:
1511:
1509:
1503:
1502:
1500:
1499:
1494:
1489:
1484:
1479:
1474:
1469:
1464:
1459:
1454:
1449:
1444:
1439:
1434:
1428:
1426:
1420:
1419:
1417:
1416:
1414:Prime meridian
1411:
1406:
1404:Ephemeris time
1400:
1398:
1394:
1393:
1380:
1378:
1376:
1375:
1373:180th meridian
1370:
1365:
1360:
1355:
1350:
1345:
1340:
1335:
1330:
1325:
1320:
1315:
1310:
1305:
1300:
1295:
1290:
1285:
1280:
1275:
1270:
1269:
1268:
1257:
1255:
1251:
1250:
1248:
1247:
1242:
1237:
1231:
1228:
1227:
1218:
1216:
1215:
1208:
1201:
1193:
1184:
1183:
1181:
1180:
1170:
1159:
1156:
1155:
1153:
1152:
1147:
1142:
1137:
1130:
1125:
1120:
1115:
1110:
1104:
1102:
1098:
1097:
1094:
1093:
1091:
1090:
1088:Time geography
1085:
1080:
1078:Clock reaction
1075:
1074:
1073:
1063:
1057:
1055:
1051:
1050:
1048:
1047:
1042:
1037:
1032:
1027:
1022:
1017:
1012:
1007:
1002:
997:
991:
989:
983:
982:
980:
979:
974:
969:
968:
967:
962:
957:
952:
947:
942:
931:
929:
920:
913:
912:
910:
909:
896:
891:
886:
881:
880:
879:
877:time signature
874:
864:
859:
854:
848:
846:
835:
834:
832:
831:
830:
829:
819:
818:
817:
807:
802:
797:
792:
787:
781:
779:
777:
776:
771:
765:
762:
761:
759:
758:
751:
749:Temporal parts
746:
741:
736:
731:
726:
721:
719:Eternal return
716:
711:
706:
704:Chronocentrism
701:
696:
690:
688:
682:
681:
679:
678:
673:
668:
663:
658:
653:
648:
642:
640:
638:
637:
632:
626:
623:
622:
619:
618:
616:
615:
614:
613:
599:
594:
589:
584:
583:
582:
577:
576:
575:
570:
560:
555:
550:
545:
544:
543:
533:
532:
531:
515:
513:
507:
506:
504:
503:
496:
491:
489:Hindu Panchang
486:
481:
476:
471:
466:
461:
456:
455:
454:
449:
444:
433:
431:
425:
424:
422:
421:
416:
411:
406:
401:
396:
391:
386:
381:
376:
371:
366:
361:
356:
351:
345:
343:
335:
334:
332:
331:
326:
321:
316:
311:
305:
303:
294:
283:
282:
280:
279:
274:
269:
264:
258:
256:
252:
251:
246:
244:
243:
236:
229:
221:
215:
214:
202:
188:
185:
182:
181:
155:
126:
125:
123:
120:
119:
118:
109:
106:
33:six-hour clock
15:
13:
10:
9:
6:
4:
3:
2:
1991:
1990:
1979:
1976:
1974:
1971:
1969:
1966:
1965:
1963:
1948:
1945:
1943:
1940:
1938:
1935:
1933:
1930:
1928:
1925:
1923:
1920:
1918:
1915:
1911:
1908:
1907:
1906:
1903:
1901:
1898:
1897:
1895:
1891:
1885:
1882:
1880:
1877:
1875:
1872:
1870:
1867:
1865:
1862:
1860:
1857:
1855:
1852:
1850:
1847:
1845:
1842:
1840:
1837:
1835:
1832:
1830:
1827:
1825:
1822:
1820:
1817:
1815:
1812:
1810:
1807:
1805:
1802:
1800:
1797:
1795:
1792:
1791:
1789:
1787:
1786:units of time
1782:
1776:
1775:Sidereal time
1773:
1771:
1768:
1766:
1763:
1761:
1760:Galactic year
1758:
1757:
1755:
1753:
1749:
1743:
1740:
1738:
1735:
1733:
1730:
1729:
1727:
1723:
1717:
1716:Weekday names
1714:
1712:
1709:
1707:
1706:Tropical year
1704:
1702:
1699:
1697:
1694:
1692:
1689:
1687:
1684:
1682:
1679:
1677:
1674:
1672:
1671:Intercalation
1669:
1667:
1664:
1662:
1659:
1657:
1654:
1652:
1649:
1647:
1644:
1642:
1639:
1637:(lunar Hijri)
1636:
1633:
1631:
1628:
1626:
1623:
1621:
1618:
1616:
1613:
1612:
1610:
1608:
1604:
1598:
1595:
1593:
1590:
1588:
1585:
1583:
1580:
1578:
1575:
1573:
1570:
1566:
1563:
1562:
1561:
1558:
1556:
1553:
1551:
1548:
1546:
1543:
1541:
1538:
1536:
1533:
1531:
1528:
1526:
1523:
1521:
1518:
1516:
1513:
1512:
1510:
1508:
1504:
1498:
1495:
1493:
1490:
1488:
1485:
1483:
1480:
1478:
1477:Time dilation
1475:
1473:
1470:
1468:
1465:
1463:
1460:
1458:
1455:
1453:
1450:
1448:
1445:
1443:
1440:
1438:
1435:
1433:
1430:
1429:
1427:
1425:
1421:
1415:
1412:
1410:
1407:
1405:
1402:
1401:
1399:
1395:
1390:
1384:
1374:
1371:
1369:
1366:
1364:
1361:
1359:
1356:
1354:
1351:
1349:
1346:
1344:
1341:
1339:
1336:
1334:
1331:
1329:
1326:
1324:
1321:
1319:
1316:
1314:
1313:24-hour clock
1311:
1309:
1308:12-hour clock
1306:
1304:
1301:
1299:
1296:
1294:
1291:
1289:
1286:
1284:
1281:
1279:
1276:
1274:
1271:
1267:
1264:
1263:
1262:
1259:
1258:
1256:
1252:
1246:
1243:
1241:
1238:
1236:
1233:
1232:
1229:
1225:
1221:
1214:
1209:
1207:
1202:
1200:
1195:
1194:
1191:
1179:
1171:
1169:
1161:
1160:
1157:
1151:
1148:
1146:
1143:
1141:
1138:
1136:
1135:
1131:
1129:
1126:
1124:
1121:
1119:
1116:
1114:
1111:
1109:
1106:
1105:
1103:
1099:
1089:
1086:
1084:
1081:
1079:
1076:
1072:
1069:
1068:
1067:
1066:Chronobiology
1064:
1062:
1059:
1058:
1056:
1052:
1046:
1043:
1041:
1038:
1036:
1033:
1031:
1028:
1026:
1023:
1021:
1018:
1016:
1013:
1011:
1008:
1006:
1003:
1001:
1000:Arrow of time
998:
996:
993:
992:
990:
988:
984:
978:
975:
973:
972:Geochronology
970:
966:
963:
961:
958:
956:
953:
951:
948:
946:
943:
941:
938:
937:
936:
933:
932:
930:
928:
924:
921:
919:
914:
908:
904:
900:
897:
895:
892:
890:
887:
885:
882:
878:
875:
873:
870:
869:
868:
865:
863:
860:
858:
855:
853:
850:
849:
847:
845:
840:
836:
828:
825:
824:
823:
822:Wheel of time
820:
816:
813:
812:
811:
808:
806:
803:
801:
798:
796:
793:
791:
788:
786:
783:
782:
780:
775:
772:
770:
767:
766:
763:
757:
756:
752:
750:
747:
745:
742:
740:
737:
735:
732:
730:
727:
725:
722:
720:
717:
715:
712:
710:
707:
705:
702:
700:
697:
695:
692:
691:
689:
687:
683:
677:
674:
672:
669:
667:
666:Periodization
664:
662:
659:
657:
654:
652:
649:
647:
644:
643:
641:
636:
633:
631:
628:
627:
624:
612:
611:
607:
606:
605:
604:
600:
598:
595:
593:
592:Digital clock
590:
588:
585:
581:
578:
574:
571:
569:
566:
565:
564:
561:
559:
556:
554:
551:
549:
546:
542:
539:
538:
537:
534:
530:
527:
526:
525:
522:
521:
520:
517:
516:
514:
512:
508:
502:
501:
497:
495:
492:
490:
487:
485:
482:
480:
477:
475:
472:
470:
467:
465:
462:
460:
457:
453:
450:
448:
445:
443:
440:
439:
438:
435:
434:
432:
430:
426:
420:
417:
415:
412:
410:
407:
405:
402:
400:
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1922:Decimal time
1651:Astronomical
1530:Complication
1525:Atomic clock
1140:Time capsule
1134:Tempus fugit
1132:
1054:Other fields
753:
734:Perdurantism
656:Calendar era
608:
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587:Cuckoo clock
524:astronomical
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324:Unit of time
255:Key concepts
212:(in Italian)
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200:(in Italian)
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172:. Retrieved
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146:. Retrieved
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84:Papal States
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60:all'italiana
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1932:System time
1927:Metric time
1646:Solar Hijri
1572:Water clock
1555:Radio clock
1487:Time domain
1467:Proper time
1353:Leap second
1235:Chronometry
1150:Time travel
1128:System time
1035:Time domain
1020:Proper time
844:use of time
815:Father Time
795:Immortality
785:Ages of Man
714:Endurantism
671:Regnal year
651:Big History
580:water-based
479:Solar Hijri
389:Hexadecimal
339:Measurement
301:Chronometry
287:Measurement
80:Middle Ages
50:alla romana
1962:Categories
1947:Timekeeper
1900:Chronology
1884:Millennium
1770:Precession
1676:Julian day
1497:T-symmetry
1358:Solar time
1328:Civil time
852:Chronemics
827:Kalachakra
739:Presentism
724:Eternalism
630:Chronology
568:mechanical
519:Main types
437:Main types
122:References
1844:Fortnight
1691:Lunisolar
1681:Leap year
1615:Gregorian
1565:stopwatch
1540:Hourglass
1520:Astrarium
1437:Spacetime
1368:Time zone
1245:Metrology
1224:standards
1108:Leap year
1025:Spacetime
899:Yesterday
800:Dreamtime
774:Mythology
661:Deep time
573:stopwatch
548:hourglass
529:astrarium
459:Gregorian
452:Lunisolar
429:Calendars
419:Time zone
292:standards
174:6 January
148:6 January
82:, in the
53:) or the
1905:Duration
1879:Saeculum
1859:Olympiad
1701:Solstice
1630:Holocene
1607:Calendar
1507:Horology
1298:ISO 8601
1293:ISO 31-1
1168:Category
916:Time in
907:Tomorrow
769:Religion
709:Duration
676:Timeline
610:Timeline
409:Sidereal
277:Eternity
108:See also
88:monastic
73:twilight
1874:Century
1864:Lustrum
1794:Instant
1666:Equinox
1635:Islamic
1577:Sundial
1442:Chronon
1178:Commons
1101:Related
1015:Instant
1005:Chronon
987:Physics
927:Geology
918:science
790:Destiny
635:History
603:History
558:sundial
541:quantum
484:Chinese
474:Islamic
384:Decimal
379:Chinese
341:systems
267:Present
55:Italian
37:Italian
1869:Decade
1824:Moment
1819:Minute
1814:Second
1784:Other
1641:Julian
1620:Hebrew
1266:offset
1118:Moment
1113:Memory
965:period
553:marine
536:atomic
511:Clocks
469:Hebrew
464:Julian
399:Metric
272:Future
27:, Rome
1910:music
1849:Month
1809:Jiffy
1804:Shake
1799:Flick
1696:Solar
1686:Lunar
1661:Epact
1625:Hindu
1560:Watch
1515:Clock
1123:Space
955:epoch
945:chron
903:Today
872:tempo
867:Music
729:Event
563:watch
447:Lunar
442:Solar
414:Solar
404:Roman
394:Hindu
45:Roman
1854:Year
1839:Week
1829:Hour
1283:DUT1
1222:and
842:and
805:Kāla
500:List
494:Maya
290:and
262:Past
248:Time
176:2020
150:2020
113:The
31:The
1834:Day
960:era
950:eon
940:age
319:TAI
309:UTC
1964::
1278:ΔT
1273:UT
905:–
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314:UT
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130:^
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1212:e
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1198:v
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