《周易》中的陰爻為何用六、陽爻用九表示?
一(yi)、余三十六根(gen)，九揲(she)之(zhi)(zhi)(zhi)數(shu)，是(shi)為(wei)(wei)(wei)(wei)(wei)(wei)九，為(wei)(wei)(wei)(wei)(wei)(wei)“老(lao)(lao)(lao)陽(yang)(yang)(yang)”，為(wei)(wei)(wei)(wei)(wei)(wei)可(ke)變(bian)之(zhi)(zhi)(zhi)陽(yang)(yang)(yang)爻(yao)(yao)(yao)(yao)。 二(er)(er)、余三十二(er)(er)根(gen)，八(ba)(ba)揲(she)之(zhi)(zhi)(zhi)數(shu)，是(shi)為(wei)(wei)(wei)(wei)(wei)(wei)八(ba)(ba)，為(wei)(wei)(wei)(wei)(wei)(wei)“少(shao)(shao)(shao)(shao)陰(yin)(yin)(yin)(yin)(yin)(yin)”，為(wei)(wei)(wei)(wei)(wei)(wei)不(bu)變(bian)之(zhi)(zhi)(zhi)陰(yin)(yin)(yin)(yin)(yin)(yin)爻(yao)(yao)(yao)(yao)。 三、余二(er)(er)十八(ba)(ba)根(gen)，七(qi)(qi)(qi)揲(she)之(zhi)(zhi)(zhi)數(shu)，是(shi)為(wei)(wei)(wei)(wei)(wei)(wei)七(qi)(qi)(qi)，為(wei)(wei)(wei)(wei)(wei)(wei)“少(shao)(shao)(shao)(shao)陽(yang)(yang)(yang)”，為(wei)(wei)(wei)(wei)(wei)(wei)不(bu)變(bian)之(zhi)(zhi)(zhi)陽(yang)(yang)(yang)爻(yao)(yao)(yao)(yao)。 四、余二(er)(er)十四根(gen)，六揲(she)之(zhi)(zhi)(zhi)數(shu)，是(shi)為(wei)(wei)(wei)(wei)(wei)(wei)六，為(wei)(wei)(wei)(wei)(wei)(wei)“老(lao)(lao)(lao)陰(yin)(yin)(yin)(yin)(yin)(yin)”，為(wei)(wei)(wei)(wei)(wei)(wei)可(ke)變(bian)之(zhi)(zhi)(zhi)陰(yin)(yin)(yin)(yin)(yin)(yin)爻(yao)(yao)(yao)(yao)。 至(zhi)(zhi)此(ci)得(de)初(chu)爻(yao)(yao)(yao)(yao)。陽(yang)(yang)(yang)爻(yao)(yao)(yao)(yao)畫(hua)“—”，若(ruo)為(wei)(wei)(wei)(wei)(wei)(wei)老(lao)(lao)(lao)陽(yang)(yang)(yang)，則(ze)在畫(hua)旁記“九”，如其(qi)為(wei)(wei)(wei)(wei)(wei)(wei)少(shao)(shao)(shao)(shao)陽(yang)(yang)(yang)，則(ze)記“七(qi)(qi)(qi)”。陰(yin)(yin)(yin)(yin)(yin)(yin)爻(yao)(yao)(yao)(yao)畫(hua)“- -”，若(ruo)為(wei)(wei)(wei)(wei)(wei)(wei)老(lao)(lao)(lao)陰(yin)(yin)(yin)(yin)(yin)(yin)，則(ze)記“六”，若(ruo)為(wei)(wei)(wei)(wei)(wei)(wei)少(shao)(shao)(shao)(shao)陰(yin)(yin)(yin)(yin)(yin)(yin)，則(ze)記“八(ba)(ba)”。九、八(ba)(ba)、七(qi)(qi)(qi)、六謂之(zhi)(zhi)(zhi)“四營”，二(er)(er)、三、四、五、上(shang)各爻(yao)(yao)(yao)(yao)皆依初(chu)爻(yao)(yao)(yao)(yao)之(zhi)(zhi)(zhi)演法(fa)而(er)(er)得(de)出(chu)。六爻(yao)(yao)(yao)(yao)俱得(de)而(er)(er)卦成(cheng)。每爻(yao)(yao)(yao)(yao)三變(bian)，故(gu)十八(ba)(ba)變(bian)乃成(cheng)一(yi)卦。 筮(shi)法(fa)以四營象(xiang)(xiang)四時，以七(qi)(qi)(qi)象(xiang)(xiang)春(chun)(chun)，以九象(xiang)(xiang)夏(xia)(xia)，以八(ba)(ba)象(xiang)(xiang)秋(qiu)，以六象(xiang)(xiang)冬(dong)。春(chun)(chun) > 夏(xia)(xia) > 秋(qiu) > 冬(dong) > 春(chun)(chun)，其(qi)氣溫變(bian)化規律(lv)正與七(qi)(qi)(qi) > 九 > 八(ba)(ba) > 六 > 七(qi)(qi)(qi)的數(shu)字升降大致匹配。 春(chun)(chun)季(ji)為(wei)(wei)(wei)(wei)(wei)(wei)陽(yang)(yang)(yang)而(er)(er)不(bu)盛(sheng)(sheng)，故(gu)為(wei)(wei)(wei)(wei)(wei)(wei)“少(shao)(shao)(shao)(shao)陽(yang)(yang)(yang)”。從(cong)春(chun)(chun)至(zhi)(zhi)夏(xia)(xia)，由陽(yang)(yang)(yang)至(zhi)(zhi)陽(yang)(yang)(yang)，故(gu)“少(shao)(shao)(shao)(shao)陽(yang)(yang)(yang)”為(wei)(wei)(wei)(wei)(wei)(wei)不(bu)變(bian)之(zhi)(zhi)(zhi)爻(yao)(yao)(yao)(yao)。夏(xia)(xia)季(ji)為(wei)(wei)(wei)(wei)(wei)(wei)陽(yang)(yang)(yang)而(er)(er)盛(sheng)(sheng)，故(gu)為(wei)(wei)(wei)(wei)(wei)(wei)“老(lao)(lao)(lao)陽(yang)(yang)(yang)”。從(cong)夏(xia)(xia)至(zhi)(zhi)秋(qiu)，由陽(yang)(yang)(yang)轉陰(yin)(yin)(yin)(yin)(yin)(yin)，故(gu)“老(lao)(lao)(lao)陽(yang)(yang)(yang)”為(wei)(wei)(wei)(wei)(wei)(wei)可(ke)變(bian)之(zhi)(zhi)(zhi)爻(yao)(yao)(yao)(yao)。秋(qiu)季(ji)為(wei)(wei)(wei)(wei)(wei)(wei)陰(yin)(yin)(yin)(yin)(yin)(yin)而(er)(er)不(bu)盛(sheng)(sheng)，故(gu)為(wei)(wei)(wei)(wei)(wei)(wei)“少(shao)(shao)(shao)(shao)陰(yin)(yin)(yin)(yin)(yin)(yin)”。從(cong)秋(qiu)至(zhi)(zhi)冬(dong)，由陰(yin)(yin)(yin)(yin)(yin)(yin)至(zhi)(zhi)陰(yin)(yin)(yin)(yin)(yin)(yin)，故(gu)“少(shao)(shao)(shao)(shao)陰(yin)(yin)(yin)(yin)(yin)(yin)”為(wei)(wei)(wei)(wei)(wei)(wei)不(bu)變(bian)之(zhi)(zhi)(zhi)爻(yao)(yao)(yao)(yao)。冬(dong)季(ji)為(wei)(wei)(wei)(wei)(wei)(wei)陰(yin)(yin)(yin)(yin)(yin)(yin)而(er)(er)盛(sheng)(sheng)，故(gu)為(wei)(wei)(wei)(wei)(wei)(wei)“老(lao)(lao)(lao)陰(yin)(yin)(yin)(yin)(yin)(yin)”。從(cong)冬(dong)至(zhi)(zhi)春(chun)(chun)，由陰(yin)(yin)(yin)(yin)(yin)(yin)轉陽(yang)(yang)(yang)，故(gu)“老(lao)(lao)(lao)陰(yin)(yin)(yin)(yin)(yin)(yin)”為(wei)(wei)(wei)(wei)(wei)(wei)可(ke)變(bian)之(zhi)(zhi)(zhi)爻(yao)(yao)(yao)(yao)。 因(yin)此(ci)，實際(ji)上(shang)九、七(qi)(qi)(qi)都是(shi)陽(yang)(yang)(yang)爻(yao)(yao)(yao)(yao)，而(er)(er)八(ba)(ba)、六都是(shi)陰(yin)(yin)(yin)(yin)(yin)(yin)爻(yao)(yao)(yao)(yao)。陽(yang)(yang)(yang)爻(yao)(yao)(yao)(yao)兩(liang)(liang)營數(shu)中取大者（九、老(lao)(lao)(lao)陽(yang)(yang)(yang)），陰(yin)(yin)(yin)(yin)(yin)(yin)爻(yao)(yao)(yao)(yao)兩(liang)(liang)營數(shu)中取小者（六、老(lao)(lao)(lao)陰(yin)(yin)(yin)(yin)(yin)(yin)），以陽(yang)(yang)(yang)之(zhi)(zhi)(zhi)盛(sheng)(sheng)者指代(dai)陽(yang)(yang)(yang)爻(yao)(yao)(yao)(yao)，以陰(yin)(yin)(yin)(yin)(yin)(yin)之(zhi)(zhi)(zhi)盛(sheng)(sheng)者指代(dai)陰(yin)(yin)(yin)(yin)(yin)(yin)爻(yao)(yao)(yao)(yao)。...
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