Solar terms problem
Overview of solar terms
In seasons and months, the sun will reach the first, second and third phases (* * * seventy-two phases) of the Zodiac (compare the month and day of the year AD).
spring
The first month of spring
In early spring, 3 15 east wind thawed the stinging insects, and on February 3-5, the fish began to freeze.
Rain 330 Rex sacrificed fish to Hongyan to plant germination in February 18-20.
The second month of spring
345 degrees in a daze, peach blossoms, eagles become pigeons. March 5-7.
0 vernal equinox, on March 20, the black bird began to ring -2 1 in Renai.
The last month of spring
The MICROTUS fortis turned into a rainbow in the Qing Dynasty 15 on April 4-6.
At 30 degrees in Grain Rain, pigeons began to sing and their feathers were brushed. Mulberry falls in Dai Sheng from April 19 to April 2 1.
summer
The first month of summer
Early summer, 45 degrees, earthworms out, 5-7 days Wang Gua was born.
Bitter vegetables with a height of 60 degrees died in summer until May 20-22.
middle of summer
The 75-degree mango anchovies born by Mantis began to sing, but their tongues were silent. June 5-7.
Pinellia ternata was born on June 26 at 438+0-22, at 90 degrees from summer solstice.
The last month of summer
It's July 6-8, from the warm wind of 105 to the residence of crickets and falcons.
120 During the summer heat, rotten grass turns into firefly soil, and it will rain heavily on July 22-24.
autumn
The first month of autumn
From the cool breeze of 135 in early autumn to the beginning of the Millennium in Qiu Chan, August 7-9.
Summer heat 150. The eagle was the first place to worship birds. Sukhnaden is from August 22nd to 24th.
The second month of autumn
White deer 165 Hongyan comes to the mysterious bird to raise shame. September 7-9.
/kloc-at 0/80 autumnal equinox, thunder began to ring, and the water began to dry up from September 22 to 24.
The last month of autumn
Cold dew 195 Hongyan finches flooded for mussels, chrysanthemums and yellow flowers 65438+1October 8-9.
First frost 2 10 jackal is the sacrifice of animals, plants, trees, stinging insects and salt drops in October 65438+23-24.
winter
The first month of winter
In beginning of winter, the water began to freeze at 225 degrees, and the flood began on June165438+1October 7-8.
240 rainbows have no weather rising to stop light snow, and the ground drops in winter165438+1October 22-23.
Winter Solstice
It snows at 255 degrees, birds don't sing, and tigers begin to cross. Litchi is quite healthy+6 -8 February 65438.
Winter solstice 270 earthworm-elk-knot spring sports 65438+February 2 1-23.
The last month of winter
Xiao Han 285 The magpies in the northern border of Yanbei started to nest, and started to nest 65438+1October 5-7.
Abdominal stiffness in Shui Ze is 65438+1October 20th -2 1 at the beginning of the great cold.
Solar term date speed algorithm: general birthday formula -[y× d+c]-l
Y= year, D=0.2422, L= leap year, and C depends on solar terms and year.
In this century, the C value of beginning of spring is 4.475, and the beginning of spring date of 20 17 is as follows:
[20 17×0.2422+4.475]-[20 17/4- 15]=492-489=3
So the beginning of spring date of 20 17 is February 3rd, as simple as that.