Chushu (End of Heat)
Chushu is the moment the Sun reaches 150° of apparent ecliptic longitude. It is one of the twelve "Qi", which do not move the BaZi month boundary.
Chushu in 2020–2035
| Year | Instant (UTC+8) | Day |
|---|---|---|
| 2020 | 2020-08-22 23:44:56 | Sat |
| 2021 | 2021-08-23 05:34:58 | Mon |
| 2022 | 2022-08-23 11:16:11 | Tue |
| 2023 | 2023-08-23 17:01:18 | Wed |
| 2024 | 2024-08-22 22:55:03 | Thu |
| 2025 | 2025-08-23 04:33:51 | Sat |
| 2026 | 2026-08-23 10:18:49 | Sun |
| 2027 | 2027-08-23 16:14:19 | Mon |
| 2028 | 2028-08-22 22:00:56 | Tue |
| 2029 | 2029-08-23 03:51:37 | Thu |
| 2030 | 2030-08-23 09:36:24 | Fri |
| 2031 | 2031-08-23 15:23:20 | Sat |
| 2032 | 2032-08-22 21:18:21 | Sun |
| 2033 | 2033-08-23 03:01:51 | Tue |
| 2034 | 2034-08-23 08:47:46 | Wed |
| 2035 | 2035-08-23 14:44:11 | Thu |
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 Chushu about 5 hours 49 minutes later each year until a leap day pulls it back. That is the whole reason Chushu 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