What is the solar projection of winter solstice in Suqian area?

The sun projection angle from winter to sunrise in Suqian area is 27.4 degrees, which is explained by the following formula:

First of all, introduce the sun projection angle. The solar projection angle refers to the angle between the projection of solar rays on the ground and the local meridian. Due south is 0, west is positive and east is negative. For example, due west is 90 degrees.

Others can be analogized in turn. Its formula is cosA=(sinhsinφ-sinδ)/(coshcosφ), where A is the azimuth of the sun, H is the height of the sun at that time, φ is the local latitude, and δ is the declination of the sun, that is, the latitude where the direct point of the sun is located.

The solstice in winter is the shortest day in a year. From winter to the future, the direct point of the sun gradually moves northward, and the days in the northern hemisphere gradually become longer and the nights gradually become shorter.

In addition, the winter solstice begins to count to nine, and the winter solstice becomes the first day to count to nine. As for "Counting Nine", there is a folk song that goes like this: "Don't do it in September, walk on the ice in March and April, watch the willows along the river in May and June, open the river in July and September, geese come in August and September, and cows go everywhere in September and September."