Precise Astronomical Data

24 Solar Terms Calendar for 1866
Vietnam (Hanoi)

Accurate 24 solar terms lookup table for 1866 in Vietnam (Hanoi) (Asia/Ho_Chi_Minh). Data includes start dates and times for solar terms from Lichun to Dahan, calculated using modern astronomical algorithms to help users identify key time markers for agriculture, feng shui, and daily life.

In Vietnam (Hanoi): solar terms are calculated according to the Asia/Ho_Chi_Minh timezone. Tinh Menh Do has adjusted errors based on the center coordinates 21.0285, 105.8542 to ensure the most accurate results for this region.

When do the 24 Solar Terms of 1866 begin?

"The 24 solar terms system reflects the movement of the sun, serving as a guide for agriculture, health, and spiritual life in the East. It is also the basis for many metaphysical calculations."

Location: Asia/Ho_Chi_Minh (21.02850, 105.85420) • Year: 1866
Spring •
Wood
Start of Spring
Beginning of spring, everything starts a new cycle
Sunday, February 04, 1866 amt 06:56:12
Rain Water
Spring rain appears, humidity increases, trees turn green
Monday, February 19, 1866 amt 03:02:46
Awakening of Insects
Insects wake up, spring thunder echoes through the sky
Tuesday, March 06, 1866 amt 01:37:56
Spring Equinox
Middle of spring, day and night are equal in length
Wednesday, March 21, 1866 amt 02:54:19
Pure Brightness
Clear and bright weather, time to visit ancestral tombs
Thursday, April 05, 1866 amt 07:25:31
Grain Rain
Rain facilitates the growth of cereal crops
Friday, April 20, 1866 pmt 14:59:06
Summer •
Fire
Start of Summer
Beginning of summer, temperature rises rapidly
Sunday, May 06, 1866 amt 01:45:25
Grain Bud
Grains start to fill but are not yet ripe
Monday, May 21, 1866 pmt 15:03:29
Grain in Ear
Grains begin to ear, busy time for planting
Wednesday, June 06, 1866 amt 06:40:59
Summer Solstice
Peak of summer, the longest day of the year
Thursday, June 21, 1866 pmt 23:33:49
Minor Heat
Weather starts to get sweltering but not at its peak yet
Saturday, July 07, 1866 pmt 17:13:39
Major Heat
Extremely hot weather, the hottest period of the year
Monday, July 23, 1866 amt 10:28:21
Autumn •
Metal
Start of Autumn
Beginning of autumn, air becomes cool and pleasant
Wednesday, August 08, 1866 amt 02:45:03
End of Heat
Heat gradually ends, summer heat recedes
Thursday, August 23, 1866 pmt 17:02:39
White Dew
White dew appears, nights start to get chilly
Saturday, September 08, 1866 amt 04:56:17
Autumnal Equinox
Middle of autumn, day and night are equal in length
Sunday, September 23, 1866 pmt 13:50:23
Cold Dew
Cold dew, signaling that winter is approaching
Monday, October 08, 1866 pmt 19:37:48
Frost Descent
Frost descends, temperature drops significantly
Tuesday, October 23, 1866 pmt 22:13:53
Winter •
Water
Start of Winter
Beginning of winter, everything turns to rest
Wednesday, November 07, 1866 pmt 21:53:15
Minor Snow
Light snow starts to fall in northern regions
Thursday, November 22, 1866 pmt 18:58:35
Major Snow
Heavy snow, climate becomes very cold
Friday, December 07, 1866 pmt 14:03:37
Winter Solstice
Peak of winter, the longest night of the year
Saturday, December 22, 1866 amt 07:49:08
Minor Cold
Slight cold weather, beginning of the freezing phase
Friday, January 05, 1866 pmt 19:04:41
Major Cold
Extreme cold, the coldest period of the year
Saturday, January 20, 1866 pmt 12:26:17

View solar terms for other years in Vietnam (Hanoi)

1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871
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View solar terms for 1866 in other regions

📍 Singapore 1866 📍 Malaysia (Kuala Lumpur) 1866 📍 China (Beijing) 1866

Why is accurate solar terms calculation important?

"Years pass by, solar terms rotate - The foundation of East Asian calendar"

Astronomical Principle

Solar Orbit

The 24 solar terms are determined based on Earth's position on its orbit around the Sun (Ecliptic). The entire 360° circle is divided into 24 equal segments of 15° each.

  • Solar system: Solar terms are actually a solar calendar, fixed to the sun's position.
  • Reference point: Starts from Lichun (315°) or Vernal Equinox (0°).
  • Cycle: Each solar term lasts about 15 days.
Practical Significance

Natural Rhythm

The names of the solar terms reflect the actual changes in climate, weather, and phenology throughout the year, guiding agricultural cultivation and daily life.

  • Subtle observation: Detailed divisions of phases: rain (Yushui), insects awakening (Jingzhe), dew (Bailu)...
  • Metaphysics: Solar terms are the foundation for determining the Can Chi calendar in Eastern metaphysics.
  • Health cultivation: Guidelines for a lifestyle in harmony with the rhythm of nature.
Digital Technology

Precise Calculation

Combines a modern astronomical algorithm (Astronomy Engine) with digital geographic data to provide absolute accuracy.

  • Solar Time (Apparent Solar Time): Calculated based on actual longitude, not just administrative time zones.
  • Multi-platform: Standardized data for any location globally.
  • AI Integration: Analysis and forecasting based on historical and astronomical data.

How to view the solar terms calendar for other years?

View solar terms for other years in Vietnam (Hanoi) (Default location) or re-select another location on the map and search box

Solar Terms Lookup

Select a location on the map for fastest results. Use city search if map selection is imprecise.

Additional Information

What is different about solar term times in Vietnam (Hanoi)?

Due to differences in longitude and time zones (Asia/Ho_Chi_Minh), the start time of solar terms in Vietnam (Hanoi) will differ from Vietnam or International UTC time. The data table above has been accurately converted to local time for easy lookup and application.

Data Accuracy

Data is calculated using algorithms that ensure high accuracy down to the minute for the period from 1950 to 2049.

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