The four seasons are caused by the inclination of the axis of the earth and the elliptical orbit of the earth around the sun. The winter solstice is the day the sun reaches the farthest north or south of the equator (summer and winter). When the sun comes directly above the equator of the earth (autumn and spring), a dime will occur
Finally, I think that science can not necessarily be separated from commercialization and colonialism. The discussion of science, technology, engineering, and mathematics 'diversity, equity and comprehensiveness' must be regarded as a recycling program for colorful people. European and American imperialism and colonialism (and unfortunately) have been spared in science unfortunately. And now it is time for us to regain our heritage for ourselves and the next seven generations. Note: In the United States, Southeast Asia, and parts of Australia prior to Europe, the browse list of scientific materials is very small. I may have missed something, but I think it will also be a problem in studying the history of science. Also I did not promise to declare integrity or update regularly using the latest survey results. Also see the US / Canada racial discrimination assessment list.
If science learned recently, especially from Bill Bryson's "almost all short history", learned one thing, science is not reaching the final truth of any form. As humans evolve, learn and grow, all of science will evolve, change and be redefined. One day, we may reach different scientific understandings about our universe, or it may not be.
During the finals, I envied my friend in the field of science and social science. I think that my students have similar emotions. The course of statistics and economics may end with decisive multiple choice or short term answer, but the course of humanities often depends on long papers. It may be very difficult for students to write papers, but in general these papers are difficult to score, especially in narrow windows between the finals and the expiration of the results.