How to calculate the height angle of the sun from winter to the sun

The solar height from winter solstice is calculated as follows:

In fact, it is not difficult to calculate the height angle of the sun from winter to sun. He has a unified formula that can replace calculation. The specific formula is as follows, only the latitude of the city is known.

The formula for calculating the solar altitude angle from winter to sunrise is: an = 90-(B 1+B0), an is the solar altitude angle, B 1 is the latitude of the city, and B0 is the latitude of the tropic of cancer = 23 26'.

Take Nanjing as an example, let you see how high the sun is in winter solstice in Nanjing. From the earth, we know that the latitude of Nanjing is 32 03'. Substituting this latitude into the formula, it is concluded that the sun height in winter solstice in Nanjing is 90-(32 03'+23 26') = 3471'.