有关古代是如何记录时间ppt课件

,AncientMeasuringToolchangetime,1,AncientChinesesundialtimeuse,inadditiontodriptimer,Tanghasmadeclocksandwatches,theerrorisnotmorethan30seconds.Modernuseofquartzwatches,electronicwatches,atomicclocksandothertiming,2,sundial,3,AncientChinesesundialismeasuredusingshademomentofyetanothertimingdevice.Usuallycopperdiscpointerandstonecomposition.Copperpointercalledsundialneedlestonedisccalledsundialface.Usedtoobservethesunsshadowcastonlocationinthedisk,wecanidentifydifferenttimeperiods.Sundialstimeaccuratetothemomentaccuracy(15minutes).日晷是我国古代利用日影测得时刻的又一种计时仪器。通常由铜制的指针和石制的圆盘组成。铜制的指针叫做“晷针”，石制的圆盘叫做“晷面”。使用时，观察日影投在盘上的位置，就能分辨出不同的时间。日晷的计时精度能准确到刻（15分钟）。,4,Gnomon,5,AncientChinesesundialisasimpleandimportanttest-dayinstrument,whichconsistsofaverticaltable(eightfeettall)andthelevelofthecompositionofGuyana.Itusestheimmediatereasontomeasurethelengthofshade.Mainfunctionwastodeterminewherethewintersolstice,andthusdeterminethetropicalyearlength.Inaddition,byobservingchangesinthetabletodeterminethedirectionoffilmandsolarterms.圭表是一种既简单又重要的测天仪器，它由垂直的表（一般高八尺）和水平的圭组成。它利用了立竿见影的道理来测量日影长度。主要功能是测定冬至日所在，并进而确定回归年长度。此外，通过观测表影的变化可确定方向和节气。,6,Ancientwaterclock,7,ThatiswithachiselinHudiornearthebottomofthewatercontainersandtoolswithsmallholes,useofwaterholessothatthewaterlevelchangesincopperkettlestocomputingtime.MyinventionTonghudiloudriptimerthanforeignproductiontoearlyandmoreapplicationsarecommon,asanimportanttoolforsuccessivetime.即用一个在壶底或靠近底部凿有小孔的盛水工具，利用孔口流水使铜壶的水位变化来计算时间。我国发明的铜壶滴漏比外国制作的滴水计时器要早的多，应用也普遍，成为历代计时的重要工具。,8,Armillarysphere,9,Water-poweredPlanetarium,10,sandglass,11,石英表,电子表,机械表,原子钟,12,OverviewofthedevelopmentprocessofChinastimeisasocialhistoryofscienceandtechnology.MonarchYaofrom4000yearsagoduringthe“KingTuguitest,”beganafterthetimerwithasundial,LouKe,Hongsealclock,hourglass,mechanicalwaterclocks,mechanicalclocks,astronomicalclock,quartzclock,molecularclock,atomicclocktime.manaccuracyhasreached3000million。纵览中国计时发展的过程，就是一部社会科技进步的历史。