Xiaoshu (Minor Heat)
Xiaoshu is the moment the Sun reaches 105° of apparent ecliptic longitude. It is one of the twelve "Jie" — the BaZi month pillar turns to the 未 month at this instant, and the governing month changes with it.
Xiaoshu in 2020–2035
| Year | Instant (UTC+8) | Day |
|---|---|---|
| 2020 | 2020-07-06 23:14:28 | Mon |
| 2021 | 2021-07-07 05:05:29 | Wed |
| 2022 | 2022-07-07 10:38:01 | Thu |
| 2023 | 2023-07-07 16:30:41 | Fri |
| 2024 | 2024-07-06 22:20:03 | Sat |
| 2025 | 2025-07-07 04:04:59 | Mon |
| 2026 | 2026-07-07 09:56:57 | Tue |
| 2027 | 2027-07-07 15:37:03 | Wed |
| 2028 | 2028-07-06 21:30:18 | Thu |
| 2029 | 2029-07-07 03:22:23 | Sat |
| 2030 | 2030-07-07 08:55:29 | Sun |
| 2031 | 2031-07-07 14:48:51 | Mon |
| 2032 | 2032-07-06 20:40:54 | Tue |
| 2033 | 2033-07-07 02:24:57 | Thu |
| 2034 | 2034-07-07 08:17:39 | Fri |
| 2035 | 2035-07-07 14:01:11 | Sat |
Why it is not the same date every year
A tropical year runs about 365.2422 days while a calendar year is a whole 365 or 366. The leftover quarter-day accumulates, pushing Xiaoshu about 5 hours 49 minutes later each year until a leap day pulls it back. That is the whole reason Xiaoshu lands on different dates across 2020–2035 and drifts within roughly a day: the term itself is perfectly regular — every 15° of longitude — and the wobble belongs to the calendar, not the sky.
By term
- Chunfen
- Qingming
- Guyu
- Lixia
- Xiaoman
- Mangzhong
- Xiazhi
- Xiaoshu
- Dashu
- Liqiu
- Chushu
- Bailu
- Qiufen
- Hanlu
- Shuangjiang
- Lidong
- Xiaoxue
- Daxue
- Dongzhi
- Xiaohan
- Dahan
- Lichun
- Yushui
- Jingzhe
Sources
- lunar-javascript (6tail, MIT) — solar-term instants, 干支 pillars, 大運/流年, 胎元/命宮/身宮 and the almanac tables.
- Hong Kong Observatory, Date and Time of the 24 Solar Terms — the reference used to check solar-term instants.
- Xieji Bianfang Shu and Sanming Tonghui — classical sources for the Wuhu Dun and Wushu Dun stem rules, hidden stems and the Ten Gods.
Algorithms last checked: 2026-07 · Method and accuracy