Day and night change on Earth due to the fact that our planet revolves on its axis. One of the assumptions why this happened is that even at the beginning of the formation of the Earth, another planet crashed into it, forcing ours to revolve around its axis.
Day on Earth in the part that is turned towards the Sun and vice versa.
The length of the day is not exactly 24 hours, as is commonly believed, but 23 hours 56 minutes 3 seconds. Because of this difference, an additional day appears every four years.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.