I won't repeat the information can be easily found about the Qi Xi Festival (7th Evening Festival). We know about the romance between the Cowherd and the Weaver Girl, but some may not know that both are actually literal stars in the Northern Sky. Cowherd is Altair, and the Weaver Girl is Vega. They are separated by the Milky Way, and the star that serves as the bridge between both is Deneb.
These 3 stars form what is called 'The Summer Triangle'. Altair is the brightest star in the constellation Aquila; Vega is the brightest in Lyra; Deneb is the brightest in Cygnus. All these are Greek names derived from Ptolemy (100 - 170 AD) & his predecessor, Hipparchus (190 - 120 BC), and Western astrology has adopted these Greek names.
If you are looking for a technical explanation, this youtube video is a good guide:
There are actually alternative Chinese names given to these Greek names as Chinese astrology largely developed independently from other forms.
[Note: There was a brief period when Buddhist monk 一行 (Yi Xing) (683 - 727 AD) & Tang Dynasty Taoist alchemist 張果老 (Zhang Guo Lao) (601 - 735 AD) introduced 七政四馀 (7 Governors & 4 Residuals) to China. 七政四馀 is a mix of Chinese & Vedic astrology. It is believed that 紫薇斗数 evolved from 七政四馀.]
河鼓二 is Altair; 织女一 is Vega; 天津四 is Deneb.
All 3 stars are part of Chinese lunar mansions, which are simply another way of interpreting the shapes and patterns of the asterisms / constellations in the Northern Sky.
河鼓二 (Altair) is from 牛宿 (Ox mansion).
织女一 (Vega) is also from 牛宿 (Ox mansion).
天津四 (Deneb) is from 女宿 (Girl mansion).
Ox & Girl are located close to Capricorn and Aquarius, and the discrepancy is due to the angluar 'tilt' of the Earth's axis so that the Moon would traverse at a slightly different path from the solar ecliptic plane. This is an orbital inclination of 5.14 degrees.
The position of the Moon is different from year to year on the 7th day of the 7th lunar month. The reason is because it takes 27.3 days to revolve around the Earth. Currently the Moon is at 13 Scorpio. After sidereal adjustment, it is at 17 Libra. The Moon can be at Ox / Girl / Capricorn / Aquarius but only by coincidence.
If you watch the above youtube video, you will notice that The Summer Triangle is always very close to the zenith in the Northern Sky during the month of August. This is true in August 2020, and it is also true in August 2025, which roughly coincides with the 7th lunar month. So the Chinese people knew that Ox & Girl would literally take centre stage during this time period, and dedicated one day to commemorate the occasion. I believe they chose the 7th day arbitrarily.
Do take note. While 'Girl' (including Deneb) is generally auspicious, 'Ox' (including Altair & Vega) is considered inauspicious. Their presence in the centre of the Northern Sky should not be literally interpreted as a favourable day for romantic encounters.
That being said, practising spirituality is best thing to do for the entire 7th lunar month, regardless of which Day Master you belong to in Bazi. Hence, 七夕贡案, or the Qixi Tribute, is a favourable ritual which involves the act of praying to the 7th Sister or the 7 Goddesses for romance luck & good 'weaving' abilities which, in modern days, can refer to any sort of technical skill involving the hands.
Surprisingly, the 7th day of the 7th lunar month is also the birthday of 魁星 or 魁斗星君 (Kui Dou Xing Jun), a deity who governs all academic / literary pursuits. One can pray to this deity on this day for wisdom in preparing for the exams.




















