古人将(jiang)夜里的(de)时(shi)间还分为(wei)更和点
一(yi)夜等(deng)分为五更(geng)(geng)，一(yi)更(geng)(geng)也等(deng)于现(xian)在的二个小时(shi)(shi)(shi)，从晚上(shang)七时(shi)(shi)(shi)开始(shi)起更(geng)(geng)，一(yi)更(geng)(geng)指(zhi)七时(shi)(shi)(shi)至(zhi)(zhi)(zhi)九时(shi)(shi)(shi)，二更(geng)(geng)指(zhi)九时(shi)(shi)(shi)至(zhi)(zhi)(zhi)十一(yi)时(shi)(shi)(shi)，三(san)更(geng)(geng)指(zhi)十一(yi)时(shi)(shi)(shi)至(zhi)(zhi)(zhi)次日凌晨一(yi)时(shi)(shi)(shi)，四更(geng)(geng)指(zhi)一(yi)时(shi)(shi)(shi)至(zhi)(zhi)(zhi)三(san)时(shi)(shi)(shi)，五更(geng)(geng)指(zhi)三(san)时(shi)(shi)(shi)至(zhi)(zhi)(zhi)五时(shi)(shi)(shi)。
古人把一(yi)昼夜分为(wei)12个(ge)(ge)时(shi)(shi)(shi)辰(chen)，用(yong)12地支表(biao)示，每个(ge)(ge)时(shi)(shi)(shi)辰(chen)等(deng)于现(xian)代的二个(ge)(ge)小(xiao)(xiao)时(shi)(shi)(shi)。古时(shi)(shi)(shi)与现(xian)时(shi)(shi)(shi)对照：子时(shi)(shi)(shi)从夜间(jian)十(shi)一(yi)点(dian)到(dao)次(ci)日凌晨一(yi)点(dian)，丑时(shi)(shi)(shi)从一(yi)点(dian)到(dao)三点(dian)，寅时(shi)(shi)(shi)从三点(dian)到(dao)五(wu)点(dian)，依此类推(tui)，每隔两小(xiao)(xiao)时(shi)(shi)(shi)分别为(wei)卯时(shi)(shi)(shi)、辰(chen)时(shi)(shi)(shi)、巳时(shi)(shi)(shi)、午(wu)时(shi)(shi)(shi)、未时(shi)(shi)(shi)、申时(shi)(shi)(shi)、酉时(shi)(shi)(shi)、戊时(shi)(shi)(shi)、亥时(shi)(shi)(shi)。
“更天”前最大的数字是五，是指三时至五时。
