This small python programme is to accurately calculate the times (to millisecond) of 24 solar terms using JPL HORIZONS. 本python程式利用噴射推進實驗室的HORIZONS网上天文数据精确计算24节气时间（精确到毫秒）。
Install Python 3 (and its pip) and download the whole repository to your computer.
Install required python packages using the following command
pip install -r requirements.txt
For usage, please see test.py. An example of running the test.py is listed below, where solar terms are different from those in the Northern Hemisphere.
$ python test.py
Calculating solar terms from JPL HORIZONS data. Please wait...
Solar terms for 2021 will be (in the timezone of Australia/Sydney):
datetime ObsEclLon term
----------------------------- --------- --------------------
2021-Jan-05 14:23:26.864 AEDT 285.0 Minor Heat
2021-Jan-20 07:39:52.788 AEDT 300.0 Major Heat
2021-Feb-04 01:58:48.889 AEDT 315.0 Start of Autumn
2021-Feb-18 21:43:59.456 AEDT 330.0 End of Heat
2021-Mar-05 19:53:42.094 AEDT 345.0 White Dew
2021-Mar-20 20:37:29.732 AEDT 0.0 Autumn Equinox
2021-Apr-04 23:35:07.429 AEST 15.0 Cold Dew
2021-Apr-20 06:33:25.196 AEST 30.0 Frost
2021-May-05 16:47:11.678 AEST 45.0 Start of Winter
2021-May-21 05:37:08.063 AEST 60.0 Minor Snow
2021-Jun-05 20:52:07.232 AEST 75.0 Major Snow
2021-Jun-21 13:32:11.008 AEST 90.0 Winter Solstice
2021-Jul-07 07:05:29.830 AEST 105.0 Minor Cold
2021-Jul-23 00:26:26.821 AEST 120.0 Major Cold
2021-Aug-07 16:53:59.535 AEST 135.0 Start of Spring
2021-Aug-23 07:34:59.830 AEST 150.0 Spring Showers
2021-Sep-07 19:52:57.303 AEST 165.0 Awakening of Insects
2021-Sep-23 05:21:06.456 AEST 180.0 Spring Equinox
2021-Oct-08 12:39:03.184 AEDT 195.0 Pure Brightness
2021-Oct-23 15:51:11.137 AEDT 210.0 Grain Rain
2021-Nov-07 15:58:46.720 AEDT 225.0 Start of Summer
2021-Nov-22 13:33:44.844 AEDT 240.0 Grain Buds
2021-Dec-07 08:57:04.838 AEDT 255.0 Grain in Ear
2021-Dec-22 02:59:19.364 AEDT 270.0 Summer Solstice
A second example is in Tokyo time and Japanese term names for 2020:
$ LANGUAGE=ja python test.py 2020 Asia/Tokyo
Calculating solar terms from JPL HORIZONS data. Please wait...
Solar terms for 2020 will be (in the timezone of Asia/Tokyo):
datetime ObsEclLon term
--------------------------- --------- ----
2020- 1-06 06:30:07.610 JST 285.0 小寒
2020- 1-20 23:54:41.322 JST 300.0 大寒
2020- 2-04 18:03:21.051 JST 315.0 立春
2020- 2-19 13:57:01.327 JST 330.0 雨水
2020- 3-05 11:56:54.422 JST 345.0 啓蟄
2020- 3-20 12:49:38.258 JST 0.0 春分
2020- 4-04 16:38:11.359 JST 15.0 清明
2020- 4-19 23:45:30.125 JST 30.0 穀雨
2020- 5-05 09:51:24.482 JST 45.0 立夏
2020- 5-20 22:49:18.348 JST 60.0 小満
2020- 6-05 13:58:27.000 JST 75.0 芒種
2020- 6-21 06:43:42.000 JST 90.0 夏至
2020- 7-07 00:14:28.509 JST 105.0 小暑
2020- 7-22 17:36:53.554 JST 120.0 大暑
2020- 8-07 10:06:12.481 JST 135.0 立秋
2020- 8-23 00:44:56.973 JST 150.0 処暑
2020- 9-07 13:08:04.000 JST 165.0 白露
2020- 9-22 22:30:40.122 JST 180.0 秋分
2020-10-08 04:55:16.859 JST 195.0 寒露
2020-10-23 07:59:33.412 JST 210.0 霜降
2020-11-07 08:13:56.344 JST 225.0 立冬
2020-11-22 05:39:46.517 JST 240.0 小雪
2020-12-07 01:09:31.406 JST 255.0 大雪
2020-12-21 19:02:21.440 JST 270.0 冬至