Will the sunrise be delayed and the sunset be advanced?

First of all, from the autumnal equinox to the winter solstice, the direct point of the sun keeps moving southward, and the days in Buenos Aires in the southern hemisphere will become longer. Sunrise time is advanced and sunset time is delayed.

There is a hierarchical reasoning relationship here. "The direct point of the sun keeps moving southward" and "The days in Buenos Aires are getting longer and longer" are the reasons for "the sunrise time is advanced and the sunset time is delayed".

And if we want to explain why the sun's direct point will "continuously move southward" from the autumnal equinox to the winter solstice, we should mention Huang Chi Angle, because there is an angle between the earth's axis of rotation and the orbital plane of revolution, that is, "Huang Chi Angle", so in the process of revolution, the direct point changes periodically. According to this change, the ancients in China set four solar terms: vernal equinox, summer solstice, autumnal equinox and winter solstice.