今日為漢曆九月九日、重陽節之日。
《易經》將「九」定為陽數。 故重陽節名「重陽」、與有「九九」、「重九」等稱。
重陽節在戰國時期已形成、自魏晉重陽氣氛日漸濃郁、到唐代被正式定為民間節日、此後歷朝歷代沿襲至今。

中國之外、中華圈內各地區 (韓國・越南・日本・琉球) 皆慶祝。

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重陽節由來傳說為，

東漢時、汝南縣有名桓景一人、所住地突發大瘟疫、兩親因此而病逝。 桓景後到東南山拜師學藝、仙人費長房賜其一降妖青龍劍、他便每日勤學苦練。
一日、費長房對他言 「九月九日、瘟魔將再來、你可回以除害。」、並給桓景茱萸葉子一包與菊花酒一瓶、讓他家鄉父老登高避禍。
於是他便歸鄉、九月九日當天、桓景領著妻子兒女與鄉情父老登上附近一座山。 大家隨身帶上茱萸葉、瘟魔不敢近身、又喝菊花酒、避染瘟疫。

桓景最後劍刺瘟魔。 後、汝河兩岸百姓便將此事流傳下、重陽節與其習俗就從此而起。

除此、也具有另關重陽習俗原為漢宮廷之辟邪延壽習俗之說法。

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重陽節主要特殊習俗含，

敬老:
「九九」諧音「久久」、代表老人高壽、因此重陽節出現敬老活動之習俗。

配戴茱萸:
古人將茱萸作為驅邪神物、每逢重陽、人人佩戴。 後世稱之為「茱萸會」、或稱重陽節為「茱萸節」。

古人佩帶具有山茱萸、吳茱萸、食茱萸三種。 其中前兩種為中藥藥材、有潤肝燥脾、溫中下氣、除濕解鬱、去疾殺蟲等功能。

賞菊飲菊花酒：
重陽節九月九日、九九與菊酒諧音。故有喝菊花酒之習俗。
九月時秋天菊花盛開、故九月傳統漢曆內也稱「菊月」。

吃重陽糕與節日食品：
唐宋時講究重陽食糕、因「糕」與「高」同音，古人相信「百事皆高」、所以重陽節登高時吃糕象徵步步登高。
重陽糕形狀不定、所吃糕點包含紅龜粿、花糕等多類。

除了重陽糕、重陽節也有食花煎、花菜、茄子與烤乳豬等食品之習。

登高：
重陽登高習俗始於西漢、除了重陽由來傳說之影響、重陽節前後天氣漸涼、為登山活動的好時。

放「鷂」(風箏)

除了以上、中國各地具有豐富多樣因地而異之獨特重陽節習俗。
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Today is the ninth day of the ninth month in the traditional Hann Calendar, the day of the Chongyang festival (重陽節).
The Book of Yih-Jing or I-Ching (易經) defines Jeou (九, Nine) is defined as a Yang (陽; part of the Yin-Yang system) number.

Thus, this is how the Chongyang Festival obtained the name of "Chongyang" (重陽, Double-Yang), and also its many other names such as "Jeou-Jeou" (九九, lit. Nine-Nine) and "Chong-Jeou" (重九, Double-Nine).

The Chongyang festival was already formed by the time of the Janngwo era (戰國時期; Warring States Era), and became better refined in the time of the Wey (魏) and Jinn (晉) Dynasties.
During the Tang Dynasty (唐朝), Chongyang became an official folk festival, and has been passed down by the later dynasties, to the modern day.

Aside from China, other areas within the Sinosphere (Korea, Vietnam, Japan, Ryukyu/Okinawa) also celebrate local variations of the Chongyang Festival.

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The origin of Chongyang comes with a legend,
During the Dong Hann (東漢) or Eastern Han Dynasty era, there was a man named Hwan Jiing (桓景) who lived in Ruu Nan (汝南縣 ; an area in Central-Eastern China).
One day an epidemic suddenly broke out, and Hwan Jiing's parents died as a result of the epidemic. He later went to Dongnan mountain (東南山) to become a disciple and learn the arts.

A shian (仙; sage, immortal) named Fey Charng Farng (費長房) gave Hwan Jiing a Jiann or Chinese sword named the "Jiang Yiau Chinglong Jiann" (降妖青龍劍), and he practiced day and night to refine himself and his knowledge.

One day, Fey Charng Farng told Hwan Jiing that the Wuen Mo (瘟魔; Demon of Disease) shall come again on the 9th day of the 9th month, and that he was allowed to return home to eradicate the demon, while also giving him a pouch of dogwood leaves and a bottle of Jyuhua Jeou (菊花酒, Chrysanthemum Wine) to allow his townspeople to stay safe during the plague.

And so Hwan Jiing returned to his hometown, and on the 9th day of the 9th month, led his family and townspeople up a nearby mountain, along with instructing everyone to wear dogwood leaves on their clothing, and to take a drink of the given wine to protect from disease.

Hwan Jiing later killed the demon with his Jiann, and this tale was passed down generation-to-generation by the people living near the Ruu river, eventually forming the festival of Chongyang.

There is also another possible origin of Chongyang which describes it as an Imperial custom believed to ward off evil spirits and aid longevity, practiced within the Hann Imperial Court.

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The main unique customs of Chongyang include,

Chrysanthemum viewing and drinking Jyuhua Jeou:
The Chongyang Festival falls on the 9th day of the 9th month, at a time when Chrysanthemum flowers bloom, thus a flower-viewing custom was created.

In the traditional Hann calendar, the 9th month is also called "Jyu-Yueh" (菊月), the month of Chrysanthemums.

Eating Chongyang-Gau (重陽糕; Chongyang Cakes) and other festive food:
During the Tang and Song Dynasty, the custom of eating festive cakes unique to Chongyang was better developed and refined.
In Chinese, the word for "cake" (糕) and "high" (高) are nearly identical, thus eating Chongyang-Gau symbolizes achieving progress, advancement, and success.

Chongyang-Gau come in many shapes and forms, with different varieties from all over China.

Aside from Chongyang-Gau, food such as eggplants, Hua Jian (花煎) and Hua Tsay (花菜) among other festive food, also differing depending on region.

Denggau (登高):
Originating from the Shi-Hann (西漢) or Southern Han Dynasty era, denggau is a traditional custom of hiking or climbing heights or mountains, also practiced during other festivals.

Wearing herbal leaves:
In ancient China, herbs like dogwood among others were believed to be a charm able to ward off evil spirits.
Thus people wore pouches often contained herbs used in traditional Chinese medicine.

Aside from these, activities to show respect to the eldery, flying Yao (鷂) or kites and other many various region-specific customs exist throughout all of China.