Can it be said that the sunshine time in Beijing is shorter than that in Guangzhou all year round because of the dimension?

Not necessarily. The sunshine hours in Beijing and Guangzhou are different because of the different direct angles of the sun. The vernal equinox and autumnal equinox solar terms are equally divided between day and night in the world, and the sunshine hours in Beijing and Guangzhou are of course the same. However, when the sun shines directly in the northern hemisphere, such as the summer solstice, the sun shines directly on the Tropic of Cancer. In the northern hemisphere, the sun rises in the northeast and sets in the northwest. Therefore, the days in the northern hemisphere are long and the nights are short, and the days are longer as you go north. When the sun shines directly in the southern hemisphere, the situation is just the opposite. For example, on the winter solstice, the sun shines directly on the Tropic of Cancer. In the northern hemisphere, the sun rises in the southeast and sets in the southwest. In the northern hemisphere, the days are shorter and the nights are longer, and the days are shorter and the nights are longer in the north. At this time, the sunshine time in Beijing is shorter than that in Guangzhou ... ~ o (∩ _ ∩) o