No, it is not constant, and cannot be constant, because in the same time the planet travels a different distance. At aphelion, the orbital speed is almost a kilometer per second higher than at perihelion. True, the change in speed occurs smoothly and imperceptibly, and practically does not affect the change of seasons.
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.