Mangzhong (Grain in Ear)
Mangzhong is the moment the Sun reaches 75° of apparent ecliptic longitude. It is one of the twelve "Jie" — the BaZi month pillar turns to the 午 month at this instant, and the governing month changes with it.
Mangzhong in 2020–2035
| Year | Instant (UTC+8) | Day |
|---|---|---|
| 2020 | 2020-06-05 12:58:26 | Fri |
| 2021 | 2021-06-05 18:52:06 | Sat |
| 2022 | 2022-06-06 00:25:49 | Mon |
| 2023 | 2023-06-06 06:18:21 | Tue |
| 2024 | 2024-06-05 12:09:54 | Wed |
| 2025 | 2025-06-05 17:56:32 | Thu |
| 2026 | 2026-06-05 23:48:21 | Fri |
| 2027 | 2027-06-06 05:25:48 | Sun |
| 2028 | 2028-06-05 11:16:00 | Mon |
| 2029 | 2029-06-05 17:09:58 | Tue |
| 2030 | 2030-06-05 22:44:30 | Wed |
| 2031 | 2031-06-06 04:35:42 | Fri |
| 2032 | 2032-06-05 10:27:59 | Sat |
| 2033 | 2033-06-05 16:13:27 | Sun |
| 2034 | 2034-06-05 22:06:41 | Mon |
| 2035 | 2035-06-06 03:50:50 | Wed |
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 Mangzhong about 5 hours 49 minutes later each year until a leap day pulls it back. That is the whole reason Mangzhong 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