Looking for the "solar declination table", where can I find it?

The first method: calculate according to the yellow meridian.

The regression movement of the sun is quantitatively manifested as the change of solar declination. At any time, the declination of the sun is always equal to the latitude of the direct point of the sun. The 24 solar terms are divided according to the meridian of the sun, and the more important difference lies in the difference of the declination of the sun. The declination of the sun affects the length of day and night and the height of the noon sun, both of which are the main factors of seasonal changes.

The declination of the sun varies with longitude. According to the ecliptic of the sun, we can know the corresponding solar declination, and its calculation formula is:

sinδ= 0。 3977 New λ

Of course, this method must first know the ecliptic.

The second method: direct calculation

Solar declination angle

ED = 0.3723+23.2567 sinθ+0. 1 149 sin 2θ

-0. 17 12 sin 3θ-0.758 cosθ+0.3656 cos 2θ

+0.020 1cos3θ(5)

Where θ is called the sun angle, i.e.

θ=2πt/365.2422

Here t consists of two parts, namely

t=N-N0

Where n is the product day, and the so-called product day is the serial number of the days in a year. For example, the product day of 65438+1 October 1 is1,the product day of 65438+February 3 1 is 365, and the leap year is 366.

N0 = 79.6764+0.2422× (year-1985)

-INT〔year- 1985)/4〕

The third method: directly check the calendar.

:83/pub/utility/time/calendar shuttle . zip

This is the solar calendar, and the information you can query includes: daily solar calendar, lunar calendar, hijri date, solar terms and holidays, heavenly stems and earthly branches of year, month and day, the time when solar terms intersect, the time of the moon phase and the first month (accurate to the second), solar eclipse, the ratio of the bright side of the moon at every moment, the date sequence of Julian day, the number of days from today, the number of days from any two dates, and every day/kloc- There are about 65,438+0,800 towns in China with daily sunrise and sunset time and length (from sunrise to sunset), dawn and night time, real-time apparent positions of the sun and the moon (positions in the local sky) and charts, direct positions and charts of the sun and the moon on the earth at every moment, and coordinates of the positions of the sun and the moon at every moment and at zero o'clock every day (including the longitude of the Yellow River and red tide).

References:

1\ Introduction to the Earth (Revised Edition) (edited by Jin Zumeng and others)

2\ /cgi-bin/forum/view.cgi？ Forum = 2 & topic =132

3\ Search "Daily Search Calendar" with Baidu