The traditional
Chinese calendar divides a year into 24
solar terms (节气/節氣).[1]Shuāngjiàng, Sōkō, Sanggang, or Sương giáng (
Chinese and
Japanese: 霜降;
pinyin: shuāngjiàng;
rōmaji: sōkō;
Korean: 상강;
romaja: sanggang;
Vietnamese: sương giáng; "frost descent") is the 18th solar term. It begins when the Sun reaches the
celestial longitude of 210° and ends when it reaches the longitude of 225°. It more often refers in particular to the day when the Sun is exactly at the celestial longitude of 210°. In the
Gregorian calendar, it usually begins around October 23 and ends around November 7.
The western holiday of
Halloween occurs in this solar term.