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歌曰∶
君热金清燥,水寒木化风。
相行炎暑令,土湿雨同功。
地气静而守位,故春温夏暑秋凉冬寒为岁岁之常令,四时为六气之所生也。厥阴木为初气者,
方春气之始也,木生火,故少阴君火、少阳相火次之;火生土,故太阴土次之;土生金,故阳明
金次之;金生水,故太阳水次之,皆相生而布其令,莫不咸有绪焉。
木为初气,主春分前六十日有奇。(奇八十七刻半。)自斗建丑正至卯之中,天度至此风气
乃行也。君火为二气,主春分后六十日有奇,自斗建卯正至巳之中,天度至此暄淑乃行也。相火
为三气,主夏至前后各三十日有奇,自斗建巳正至未之中,天度至此炎热乃行也。土为四气,主
秋分前六十日有奇,自斗建未正至酉之中,天度至此云雨乃行,湿蒸乃作也。金为五气,主秋分
后六十日有奇,自斗建酉正至亥之中,天度至此清气乃行,万物皆燥也。水为六气,主冬至前后
各三十日有奇,自斗建亥正至丑之中,天度至此寒气乃行也。
六气旋相,以成一岁之主气也。天之六气客之,每岁转居于其上,以行天令者也。是故当其
时而行,变之常也;非其时而行,变之灾也。如春行夏秋冬之令,冬行春夏秋之令,此客加主之
变也。故有德化政令之常,有暴风疾雨迅雷飘电之变,冬有烁石之热,夏有凄风之清。此无他,
天地之气胜复郁发之致也。此则五气丽乎太过不及之征耳。
【六化图】
歌诀说:
君火之热,金气清燥;水寒之气,木气化为风。
相火运行炎暑之令,土湿与雨共同发挥作用。
地气安静而坚守其位,所以春温、夏暑、秋凉、冬寒是每年固定的常规气候,这是由四时中六气的变化所产生的。厥阴木作为初气,正值春季气候的开始,木生火,所以少阴君火、少阳相火紧随其后;火生土,所以太阴土接着出现;土生金,所以阳明金接着出现;金生水,所以太阳水接着出现,这都是按照相生顺序依次布散其气候特征,无不井然有序。
木作为初气,主管春分之前六十多天有余。(余八十七刻半。)从北斗斗柄指向丑正到卯中,天体度数运行至此,风气才开始盛行。君火作为二气,主管春分之后六十多天有余,从北斗斗柄指向卯正到巳中,天体度数运行至此,温暖和煦的气候才开始盛行。相火作为三气,主管夏至前后各三十多天有余,从北斗斗柄指向巳正到未中,天体度数运行至此,炎热的气候才开始盛行。土作为四气,主管秋分之前六十多天有余,从北斗斗柄指向未正到酉中,天体度数运行至此,云雨开始盛行,湿气蒸腾开始兴起。金作为五气,主管秋分之后六十多天有余,从北斗斗柄指向酉正到亥中,天体度数运行至此,清凉干燥的气候才开始盛行,万物都变得干燥。水作为六气,主管冬至前后各三十多天有余,从北斗斗柄指向亥正到丑中,天体度数运行至此,寒冷的气候才开始盛行。
六气循环相继,构成了一年的主气(固定气候规律)。天的六气作为客气(流动变化的气候),每年轮流居于主气之上,以施行天的气候命令。因此,当它在相应的时候出现,是正常的变化;不在相应的时候出现,就是灾异的变化。比如春天施行夏、秋、冬的气候命令,冬天施行春、夏、秋的气候命令,这就是客气加临于主气之上的变化。所以有德化政令的正常表现,也有暴风疾雨、迅雷飘电的异常变化,冬天有像烧红石头一样的酷热,夏天有凄冷的清风。这没有别的原因,是天地之气胜复郁发所致。这只是五行之气显现出太过或不及的征兆罢了。
[Diagram of Six Transformations]
The verse states:
The heat of Jun Fire (Ministerial Fire) is countered by the clarity and dryness of Metal; the cold of Water transforms into Wind via Wood.
Xiang Fire (Ministerial Fire) executes the command of blazing heat and summer warmth, while Earth's dampness and rain share the same efficacy.
Earthly Qi remains tranquil and maintains its position; thus, the spring warmth, summer heat, autumn coolness, and winter cold constitute the regular seasonal commands year after year. These are generated by the Six Qi (Six Atmospheric Influences) within the Four Seasons. Jueyin Wood serves as the First Qi, marking the beginning of Spring Qi. Since Wood generates Fire, Shaoyin Jun Fire (Ministerial Fire) and Shaoyang Xiang Fire (Ministerial Fire) follow subsequently. Since Fire generates Earth, Taiyin Earth follows next. Since Earth generates Metal, Yangming Metal follows next. Since Metal generates Water, Taiyang Water follows next. All proceed in accordance with the generating cycle to distribute their respective climatic commands, maintaining perfect order.
Wood as the First Qi governs for a little over sixty days before the Spring Equinox. From the time when the Big Dipper's handle points to Chou Zheng until it reaches Mao Zhong, upon reaching this celestial degree, Wind Qi begins to prevail. Jun Fire as the Second Qi governs for a little over sixty days after the Spring Equinox. From the time when the Big Dipper's handle points to Mao Zheng until it reaches Si Zhong, upon reaching this celestial degree, warm and gentle weather begins to prevail. Xiang Fire as the Third Qi governs for a little over thirty days both before and after the Summer Solstice. From the time when the Big Dipper's handle points to Si Zheng until it reaches Wei Zhong, upon reaching this celestial degree, intense heat begins to prevail. Earth as the Fourth Qi governs for a little over sixty days before the Autumn Equinox. From the time when the Big Dipper's handle points to Wei Zheng until it reaches You Zhong, upon reaching this celestial degree, clouds and rain begin to prevail, and damp steaming arises. Metal as the Fifth Qi governs for a little over sixty days after the Autumn Equinox. From the time when the Big Dipper's handle points to You Zheng until it reaches Hai Zhong, upon reaching this celestial degree, clear and crisp air begins to prevail, and all things become dry. Water as the Sixth Qi governs for a little over thirty days both before and after the Winter Solstice. From the time when the Big Dipper's handle points to Hai Zheng until it reaches Chou Zhong, upon reaching this celestial degree, cold air begins to prevail.
The Six Qi rotate sequentially to form the Main Qi (Dominant Climate) of a year. The Heavenly Six Qi act as Guest Qi (Transient Climate), shifting positions annually above the Main Qi to execute the Heavenly commands. Therefore, when these occur at their appropriate times, they represent normal variations; when they occur out of season, they represent calamitous variations. For instance, if Summer, Autumn, or Winter commands manifest in Spring, or if Spring, Summer, or Autumn commands manifest in Winter, this constitutes the variation of Guest Qi superimposed on Main Qi. Thus, there are normal manifestations of virtue, transformation, governance, and command, as well as abnormal variations such as violent storms, heavy rains, sudden thunder, and drifting lightning. There may be scorching heat in winter that melts stones, and chilling winds in summer. This is due to no other reason than the excess, deficiency, stagnation, and eruption of Heaven and Earth's Qi. These are merely signs indicating whether the Five Elements' Qi is excessive or deficient.