Reference table
The 24 Solar Terms of 1997
The 24 solar terms divide the year by the SUN'S POSITION along the ecliptic, not by lunar months. Each term begins when the sun's longitude advances another 15 degrees, which is why their start dates land on nearly fixed solar dates, shifting only a day or two from year to year.
Read across the row: the term's name, the solar date it begins in 1997, the sun's longitude at that moment, and the astronomical or seasonal event it marks. The 12 rows marked "Tiết" are the month-pillar boundaries used in Four Pillars astrology; the other 12, the "Khí", fall mid-month. Rows run in true chronological order within the year, so Tiểu Hàn and Đại Hàn in early January come before Lập Xuân.
This is traditional East Asian calendrical knowledge. The dates are astronomically computed and verifiable; the descriptions of each term's meaning are offered as cultural reference.
| Solar term | English name | Start date | Solar longitude | Type | Meaning |
|---|---|---|---|---|---|
| Tiểu Hàn | Minor Cold | 5/1/1997 | 285° | Tiết (month boundary) | Deep cold sets in |
| Đại Hàn | Major Cold | 20/1/1997 | 300° | Khí (mid-month) | The coldest stretch of the year |
| Lập Xuân | Start of Spring | 4/2/1997 | 315° | Tiết (month boundary) | Spring begins; also the year boundary in Four Pillars astrology |
| Vũ Thủy | Rain Water | 18/2/1997 | 330° | Khí (mid-month) | Spring rain replaces snow as ice melts |
| Kinh Trập | Awakening of Insects | 5/3/1997 | 345° | Tiết (month boundary) | Hibernating insects stir after winter |
| Xuân Phân | Vernal Equinox | 20/3/1997 | 0° | Khí (mid-month) | Day and night are equal as the sun crosses the equator northward |
| Thanh Minh | Clear and Bright | 5/4/1997 | 15° | Tiết (month boundary) | Clear skies; the traditional Vietnamese grave-tending season |
| Cốc Vũ | Grain Rain | 20/4/1997 | 30° | Khí (mid-month) | Rains that nourish newly sown grain |
| Lập Hạ | Start of Summer | 5/5/1997 | 45° | Tiết (month boundary) | Summer begins |
| Tiểu Mãn | Grain Buds | 21/5/1997 | 60° | Khí (mid-month) | Grain begins to fill out but is not yet ripe |
| Mang Chủng | Grain in Ear | 5/6/1997 | 75° | Tiết (month boundary) | Grain forms ears; harvest season opens |
| Hạ Chí | Summer Solstice | 21/6/1997 | 90° | Khí (mid-month) | Longest day of the year in the northern hemisphere |
| Tiểu Thử | Minor Heat | 7/7/1997 | 105° | Tiết (month boundary) | Heat sets in but has not yet peaked |
| Đại Thử | Major Heat | 23/7/1997 | 120° | Khí (mid-month) | The hottest stretch of the year |
| Lập Thu | Start of Autumn | 7/8/1997 | 135° | Tiết (month boundary) | Autumn begins |
| Xử Thử | End of Heat | 23/8/1997 | 150° | Khí (mid-month) | The heat recedes |
| Bạch Lộ | White Dew | 7/9/1997 | 165° | Tiết (month boundary) | White dew gathers at dawn as the air cools |
| Thu Phân | Autumnal Equinox | 23/9/1997 | 180° | Khí (mid-month) | Day and night are equal as the sun crosses the equator southward |
| Hàn Lộ | Cold Dew | 8/10/1997 | 195° | Tiết (month boundary) | Cold dew; the chill becomes noticeable |
| Sương Giáng | Frost Descent | 23/10/1997 | 210° | Khí (mid-month) | Frost appears in the highlands |
| Lập Đông | Start of Winter | 7/11/1997 | 225° | Tiết (month boundary) | Winter begins |
| Tiểu Tuyết | Minor Snow | 22/11/1997 | 240° | Khí (mid-month) | First snows in the north |
| Đại Tuyết | Major Snow | 7/12/1997 | 255° | Tiết (month boundary) | Heavy snowfall in the north |
| Đông Chí | Winter Solstice | 22/12/1997 | 270° | Khí (mid-month) | Shortest day of the year in the northern hemisphere |
Ordered by the solar-term cycle itself rather than by calendar year, the sequence starts at Lập Xuân: Lập Xuân → Vũ Thủy → Kinh Trập → Xuân Phân → Thanh Minh → Cốc Vũ → Lập Hạ → Tiểu Mãn → Mang Chủng → Hạ Chí → Tiểu Thử → Đại Thử → Lập Thu → Xử Thử → Bạch Lộ → Thu Phân → Hàn Lộ → Sương Giáng → Lập Đông → Tiểu Tuyết → Đại Tuyết → Đông Chí → Tiểu Hàn → Đại Hàn. See the day-by-day lunisolar calendar.
Solar term start dates are computed from the sun's apparent longitude in Vietnam time (GMT+7). Printed almanacs may differ by a day when a term begins near midnight or when they use a different time zone.
Trích dẫn trang này
Nguồn: Nhật Nguyệt - https://nhatnguyet.org/bang/24-tiet-khi/1997
